Lorena's place is in a fantastic location- everything one might need is in short walking distance, and the area is pretty nice.
The apartment itself is quite spacious, with a very large living and dining area, and two large comfortable couches.
The beds were reasonably comfortable.
The shower was absolutely fantastic- tons of hot water and very high pressure.
The internet was excellent- 190 mbps down and 150 mbps up.
The kitchen was also large and well appointed.
The air conditioning / heating elements worked quite well.
Our only concern was that it hadn't been cleaned as well as it could have been. There were visible dust bunnies in some corners, and the rug in the living room appeared to not have been vacuumed. A few of the table surfaces were also quite dusty. Aside from that though, the apartment was otherwise clean.
Also, at least one of the rooms' closets were full of bags of presumably used linens waiting to be washed, so the closets in that room ended up being unusable as there was no place to put clothing.
Overall we were happy and comfortable at Lorena's place, and would stay there again next time we're in Madrid. It's particularly good for larger groups of people, as two of the three bedrooms have restrooms attached, and there are three total restrooms.