Héctor was a great host, he was kind and very helpful. Although being a rather small apartment, the spaces inside it were very well distributed. The apartment was very cozy, well decorated and confortable. It was right next to many metro stations and to Atocha station, which gives a great location for this AirBNB. It has nice services, excellent wifi and an elevator.
One small detail, regarding the bathroom. It was rather small (which we knew about) and it sometimes (2 out of 4 days we stayed) had a strong smell. Although the smell didn't last for too long, about 15 to 30 min tops.
Very recommendable, would visit again if I had to stay in Madrid in the future.