Verónicas apartment is located in a wonderful part of the city - it's a part of Madrid that looks quite like you would imagine spain with narrow lanes and colourful houses. It's kind of the hipster part of the city I'd say. Cafés and bars around nearly each corner. This was the big big plus for our stay.
Unfortunately the room is really dark and wet as it's in the basement and the only windows are towards the corridor. It's okay for the time we sayed (4 nights), but if you want to spend > 1 week in Madrid, I'd recommend choosing something brigther and dryer.
The kitchen is clean and everything you need is there.
We had a great stay in Verónicas apartment and could walk to every sight! The location kind of makes up for the wetness and darkness. I can totally recommend it!
We could even check-in 2-3 hours early (there were some language barriers as Verónica doesn't speak English, but we found our way around it).