Alfredo's apartment is a DREAM! Location-wise it is absolutely perfect. Centrally-located within Madrid, just between Chueca and Malasaña, you'll have two great neighborhoods at your doorstep. The main sites in the city are all walking distance or easily accessible via nearby metro or bus (both easy to navigate). The apartment is between two major streets so there are always people around. As a solo woman traveler, I always felt very comfortable and safe in the area.
The apartment itself is just the right size for one or two people. It is exactly as it appears in the pictures. You will have to walk up a few flights of stairs to get to it. The terrace is so very special and was the highlight of the apartment for me.
Alfredo is an excellent host. His warm welcome set an excellent tone to an overall fantastic trip and a great example of how friendly people in Madrid are. He was easily reachable and offered great restaurant suggestions in the area. He was immediately willing to help with any questions I had. He also helped me with my (quite heavy) suitcase both during my check in and check out (that was VERY much appreciated considering the flights of stairs).
I 10/10 recommend Alfredo's place! The apartment and Madrid itself are so very lovely and you'll be sad to leave (I know I was!).