I had to find a place urgently because the person I was going to stay with canceled at the last minute, so I booked Martin's place. I was a bit concerned because of a review I read but I couldn't have been more wrong.
The place is simply amazing. It's located right in the center of Madrid, close to all the nice spot, it's big, comfortable and super clean. Exactly as advertised. Martin was also very nice providing information and being always available. My only small issue is that the elevator wasn't working but there was a sign that said that it would be ready on Tuesday, so I guess I was unlucky.
Completely recommended!