positive:
cheap room (30€per night)
very central, good for exploring madrid
could use the kitchen
overall everything was clean
negative:
we didnt get to know the hosts. we were shown everything at our arrival. no chat about where to go, where not to go etc.
poor Internet. was overall very slow. at our last day it didnt work at all. i recommend to use one of the many free hotspots in madrid if you wanna do some research.
p.s.
i recommend some ear protection to sleep at night because it is quite noisy. madrid is noisy at night, doesnt matter where you are if you wanna be in the center