I lived and worked in the flat for two months (IT). The flat is very well equipped, with fast internet, 55 inch TV (not in the photos) Kitchen and bathroom are all new and to a high standard.
The location is perfect; you are in the middle of restaurants and bars and a few minutes away from the metro. You should be aware that you live in a trendy area for people who are sensitive to noise, it might not be the right place for people who want to participate in the life of Madrid, it is perfect.
Some customers complained about the small bedroom not having a window as the room is in the middle of the building. For me the location is an advantage, if it is a bit noisy on the streets at night, then you are grateful for a quiet bedroom in the middle of the building. In addition, you can activate the ventilation, which is so silent that you really don't hear anything and thus the problem with fresh air is solved well.
The communication with Gabriel was excellent; every problem was answered and helped on the same day. I can recommend the flat and the host.