The apartment is spacious to comfortably accommodate 4-5 people and is in a great location, close to Bank of Spain metro station.
Although I haven't met Mercedes in person, she was always replying promptly to my messages and she left us in very good hands to her friend: Zoli. It was a very nice surprise to hear Zoli speaking my native language and giving us a lot of touristic hints of what to visit in Madrid in the surrounding area. I highly recommend this apartment for larger groups of 4-5 people wishing to stay in Madrid city center.
Thanks a lot, Zoli & Mercedes!