Great small apartment! I was really impressed how well planned and equipped the apartment is! There is literally everything there! Yes, it is small and sitting straight up in the bed doesn't work, but it is so well designed, that you will get used to the space immediately. Keep in mind it is on the fourth floor with quite narrow wooden steps and tall people (around 1,9m) are not able to stand up completely in the shower.
Self checkin works really good, the apartment was super clean and does in no way smell like smoke, even though smoking is permitted. Heating in winter worked. Metro is right around the corner. Lavapiés is a very multi-cultural district with lots of bars and markets. Quick communication!