We had a wonderful stay at Alfred's place. His apartment is located right nearby the happening Gran Via street. Playa de Sol and Plaza Mayor are also 20-30 mins walk. The area had lot of restaurants and looks lively throughout the night. Although the nearest metro station was closed when we got there due to construction, it didn't affect our plans that much. We used bus which is 5 mins walk from the house. His place was clean and had all the amenities we could ask for. It's 1 floor up the stairs, so keep that in mind. I would recommend this to anyone visiting Madrid.