All good!
Lina is a timely and straightforward communicator, and she made the check-in process very easy.
The apartment was clean and stylish (especially if you like white). It also had some luxurious features: a big walk-in closet, a remote for the air conditioner, a combined washer/dryer (takes longer, but you don't have to be there to change the load over), a Nespresso machine, satellite TV with a recorder, and a Sonos Bluetooth speaker.
The building is very secure. It's on a quiet street in a quiet neighborhood, but there are restaurants within a block, two metro stations nearby, and you can easily walk to Malasaña for nightlife.