The apartment is well situated and in OK neighborhood. Within 5-9 min walk (up to 600m) are Principe Pio train/metro station, Royal Palace and Plaza de Espana.
The flat is completely oriented toward small/narrow atrium. Consequence of this is that it is very quiet, i.e. there is no street noise. However, this also means that there not much sun light (didn't bother us, since we were spending most of the day time outside anyhow).
The elevator is very small, but working fine.
This is an old building and soundproofing is not good. However, the neighbors were quiet and we could hardly hear them, but be aware this is not the place for the ones that would like to party or make loud noises.
It is very clean and the beds are comfortable. Fast internet working fine.
Kitchen has the basic.
Raul is very helpful, easy to communicate with and responsive.
Recommended.