We saw people in motorized wheelchairs in Southern Spain, more in a modern city like Torremolinos than in the old parts of old cities like Seville or
Cordoba. Noticed this in a hotel near the coast and thought this might be useful. https://www.mobilityabroad-costadelsol.com/
The first thing we noticed when we got to our plane from Madrid to Malagra was how inaccessible it was. There were two older people who took non-motorized wheelchairs to the base of a flight of outside stairs, then had to climb ten steep steps to get onto the plane. One of them had two people helping her, but she still needed to be able to lift her legs and stand mostly on her own. The same thing occurred in Malagra–with the descent actually harder to have people help. One woman came down slowly by sitting on each step.
The high speed train might be a better way to go since there were separate restrooms for the disabled, and elevators to the platform. We noticed that there were cars on the local train which were accessible. While there was a slight gap, it seemed possible to cross safely and once inside, there was room for a motorized wheelchair in the special cars, including straps to hold it in place.This site might help with information about getting on and off the trains: https://disabledaccessibletravel.com/renfe-tickets/
Also, if you’re booking a place, be aware that the first floor is up a flight of stairs, not at ground level. And elevators are often too small for a motorized wheelchair.
A short distance south of Malaga, Torremolinos could be a nice, sunny spot to stay and explore. It has wide streets with very few cars on the pedestrian streets unlike older towns where everyone shares the same narrow space. There is a multi-person public elevator that goes down to the beach area–and costs a euro each way. Once down near the water, there is a walkway along the sea.
Cadiz was lovely, but the streets were cobblestone and most had cars on them, often big cars, leaving little room for a wheelchair. We did find a restaurant with a wheelchair accessible restroom and the entire (small) place was on the ground floor. The outer part of the city has some smooth sidewalks, and great views of the sea.
Seville had cobblestone streets, but it also had a bike path that was much smoother. Some of the bike paths are between where people park and the store they are heading to, and so they often linger in the middle of the path, unaware that they are in a bike path. So be on guard if using the bike path.
There were ramps at both the southern and northern end of the Spanish Plaza. Although there was also a one-inch bump to get onto the actual plaza. 
There is an elevator that provides wheelchair access to the second level. There is a phone number to call someone to operate it, but you’d need to speak Spanish to be understood, I suspect. The interesting stuff is all on the ground level anyway. Most of the Spanish plaza is viewable including the incredible tiles for each region in Spain
.
Cordoba also had a bike path as well as cobblestone roads with cars, motorbikes and people on them. The Alcazar (fortified castle) said ‘no wheelchair accessibility.’ The mosque-cathedral was a huge space without steps with lots to see. It’s reachable without being in the old city part–where the cobblestones are heaviest. The Roman Bridge is also quite accessible as well as many outside cafes. Be aware, though, that smoking is allowed outside. Still, with a bit of planning, Southern Spain could be a nice place to visit especially if not much time is spent in the old city areas.
Hotel – Mac Puerto Marina Hotel – Benalmádena
We checked out a modern-looking hotel, near the beach just south of Torremolinos, the Mac Puerto Marina Hotel is located on the Costa del Sol, in 
Benalmádena, and a few meters from the marina and the Puerto Marina shopping complex. It’s near the beach, so you don’t need an elevator to get to the water–and there is plenty of shopping and restaurants on the lower level.
It has an elevator to get to the lower level for the restaurant and bar area. There are three wheelchair accessible rooms with roll-in showers. And has ramps and elevators throughout the hotel. There’s a wheelchair accessible single bathroom between the men and women’s restrooms. There’s even a nightclub and huge bar area, all of which is accessible.
It’s one block from the beach. No sea view from the accessible rooms, but the common areas are nice and there are ramps to the boardwalk and to the beach. These don’t have the 1-inch bump that much of the boardwalk has.
There are other modern hotels in the area, and these might well have better views. Still, this looks like a very nice, modern hotel. And the nightclub and eating areas are very nice.
There are some lovely sunrises in Torremolinos. And in December-January, these are around 8:30 a.m.
