As I already emailed to you, I liked the flat, the location and the view out over Madrid rooftops. But maybe saying that there are the "best views in Madrid" is exaggerated. It's a nice view of rooftops; but not that special .
However 2 shortcomings
1) It's on the 4th floor, the floors are high and there's no lift. This is no problem if you know about it. Be fair and mention it.
My wide would have been unhappy about this.
2) It's right under the roof and ceilings are low. Especially in the bedroom and the photo cleverly hides this. Bedroom, kitchen and bathroom are under sloping ceilings and the main room has rafters. Also I bumped my head on entering the apartment. I opened the door, turned left, saw the 3 steps down and paid attention to them and wham hit the lintel above the stairs. You should really put a warning sign just inside the door.
My son at 2m would have been unhappy about this. And I would have been uncomfortable after 2 days and I only measure 1m78.