As a couple we had a great stay in this apartment.
The location was very good - right in the middle between the train station and centre. Check in was easy and the hosts were very accommodating when we arrived before the official check in time.
It does need to be noted that the sleeping arrangement isn’t ideal - you are sleeping on a mattress in the attic part which can get very warm even with the air conditioning on.
Having said that, we had a great stay in this apartment and would definitely look to stay here again if we were in Madrid.