Adolfo's apartment is really well located and was perfect for us with our main targets being the art galleries, Prado, etc. You are a five-minute walk from the wonderful Reina Sofia gallery.
The apartment itself is basic, but fine as a place to stay - clean, in a safe street. Be warned if you are unfit that there are 89 stairs to climb and no lift. Also you are charged 30-40 euros if you check-in after 10pm. Unfortunately, my flight was delayed and we had to pay this. Have requested a receipt from Adolfo so I can claim this back from the airline but had no response which is frustrating.
Adolfo is very prompt and friendly in replying to airbnb messages; however, he communicates only in Spanish and would not give a phone number, so this was not as easy as it could have been.
Overall, recommended and greatly enjoyed our visit.