This summer I wanted to stay in Val de Lobo, Portugal, in a villa, not only were they expensive but practically none were disabled friendly. This was the best I could find http://www.algarvewheelchairholidays.com/. I didn’t go so I have no idea what it was like but the pool looked great as you could wheel into it.
I had better luck in Vilamoura which had a superb hotel with a great disabled room The lake Resort. Very stylish, modern and not overly expensive for the area. The staff were very helpful and there were ramps everywhere. Getting into the pool was difficult but fun for all concerned with helping me!