All in all a nice apartment in a good location at Lavapiés.
The description of the check in was a bit misleading (a short note "if there is no key lock, jump to bullet point 5" would be perfect :-)), but gladly Ana directly answered when I was lost :-)).
(also the contact point of the key to open the front door was a bit tricky, but finally
always worked)
But the small apartment itself is perfect for a short stay!