This apartment has a great location and communication with the hosts was quick and easy. They offered lots of advice and let us store or bags there after check-out as we had a late flight.
It's useful to know that the apartment has 7 rooms sharing two bathrooms. It was not full when we were there but it may be challenging if it is very busy.
Although there is WiFi the signal strength was very poor in the bedroom and lounge.
Other than that, it's pretty well equipped and if you don't mind shared space it's a good option for central accommodation in Madrid.