Luisa's apartment is small, but very located in a very central location directly next to the "El retiro parque". It's modern and the limited space is used in an efficient way. Just be aware that there are no windows with a view, but I think the pictures should make this clear already.
Everything is already there, regarding supplies for the washing machine, the kitchen and towels for the bathroom.
The cleaning of the room, if you stay more than 30 days for 10€ is also very reasonable.
Only the Internet was a bit slow with around 10 Mbit/s, but otherwise there is nothing to complain about.
I would recommend the place, also for long-term stays!