This is the perfect place to stay if you're in Madrid.
Jose, the owner, is very kind and helpful, he replies almost immediately to any message. We stayed at this apartment with some frinds and we found it perfect for us, spacious and cozy, with both of the couples enjoying their own privacy thanks to the two bathrooms. In the kitchen we found everything: from bottled water to anything necessary for our breakfast. The apartment itself was very clean, wi-fi worked very well and also the building is nice and well mantained.
We'll come back again for sure in the future!