Johan is a great host!
He welcomes you personally to the place and will provide you some of the local tips for Madrid.
The place is conveniently located close to the city center and the best museums and everything is walking distance so no need to take any taxis or public transport.
The place is not the prettiest but it definitely works if you are just looking for a place to sleep.
One thing to note is that the place is above the metro line, so every now and then you can feel the rumbling of the train going past.