I went to Madrid for 5 days it was 4 of us. The flat is super beautiful and has everything that you need in the kitchen, towels, hairdryer, washing machine. Also the AC is great for hot Madrid summer nights. Everything was clean. The location is great, it is in the city center and we could reach everything by feet.
The check-in was a little bit difficult as we could not enter with the code provided to us. But this was a system failure, we arrived at 11pm and still we could call and tell about our problem. It was solved in 15 minutes and then we got our key. So everything was handled super fast and smooth.
I really enjoyed the stay at the appartment and would recommend it to everyone!