The outside look of this place might put you off, but once you get into the first door things change dramatically for the better. I won't say more, to avoid spoiling the surprise. ;)
The apartment is located in a central location, next to Gran Via, Oscar Hotel and Chueca, right in the middle of Madrid's amazing nightlife and shopping streets.
The apartment itself is very well decorated, with some interesting details, and is great to snap that Instagram photo.
We experienced some issues with regards to cleaning (specially in the common areas) and with the check-in (half an hour late), but overall the experience was very positive.
PS: Please note the exhaust fan does not lead the smoke anywhere. You're welcome :)