I'm a traveler, and I can say Gonzalo's apartment is one of the best I've ever rented: clean, with everything you need, super central but quiet, surrounded by great tapas bars and restaurants, groceries and produce market, 2 minutes from subway.
Gonzalo provided us with all the information we needed regarding the neighborhood, along with details about museums and other attractions in Madrid. Communication was perfect.
A sincere thank you, Gonzalo!