The appartment is very well located, right in the center of madrid. It is on the fourth floor so some exercise is required to reach it but there's a very small elevator (3 people if you really squeeze) as well. The appartment itself is small but cozy. The couch was brandnew and could be converted into a sizeable bed.
Check-In went almost perfectly, only problem was the main door not opening through the provided app. However we were able to get into contact with the hosting-org in less than a minute and they opened the doors for us. All in all great experience for a great value!