The apartment itself is brand new with all the modern facilities.
The front door opens right onto the street which isn't ideal.
The location of the apartment isn't in a very nice neighborhood. It didn't feel particularly safe.
Lots of noise in the night with people walking / standing outside of the apartment.
It is quite far out of the city centre but the bus stop is only a couple of minutes walk away.
I would not recommend it for families but would be OK for couples using it as a base to explore Madrid.