I stayed in Nicolás’s apartment for 2 nights in August and enjoyed my stay a lot. The location was great, in walking distance to the main attractions in Madrid and very close to Gran Vía. The apartment had everything I needed, the bed was comfortable and although there was no A/C the big fan in the room was very effective. What might be good to note is that the district is busy with a lot of bars so it can be bit noisy in the night, and there are also quite a many stairs up to the apartment (there is no elevator in the building).