Our stay at Angel's place was great! The apartment is very comfortable on the top floor of the building. It has an elevator so going up to the 6th (7th on US count) was easy. The place was clean and fully equipped, and both check-in and check-out were trouble free and fast. The host even had Madrid Guide Books and an outlet adapter that we borrowed during our stay there, and he also recommended places to go
Location couldn't be better. It's a short walk from two subway (metro) stations, and only 20min walk from "Puerta del Sol" and "Plaza Mayor". If using the metro, Anton Martin (not elevator access) is uphill from the apartment, and Lavapies downhill, but with elevator access. There are also couple of well stocked markets around Lavapies plaza.
The neighborhood Lavapies is also very interesting and diverse with plenty of watering holes and delicious Indian food. Actually, the food downstairs was delicious and the friendly owners of the restaurant also live in the building.
We would definitely stay there if it's available next time we're in Madrid.