Positives:
Nice modern apartment
Comfy beds, crisp bed linen
Fluffy towels
15 min walk to GranVia
Spacious shower
Negatives:
Can hear Neighbors at all times
Lack of privacy as the kitchen and second bedroom windows are facing the elevator (although there are pull down curtains but when they are down you don’t get any natural light)
Extremely dirty floors (we walked barefoot and the soles were black within minutes)
All in all, good place to stay. Would we stay there again? Probably yes, but only if we had no better choice.