Great apartment!
Check-in was very clear and straight forward.
Everything in the apartment is clean and new. The finishes are fancy. The water pressure is great. We were not there long enough to really use the washing machine, or the kitchen (since there are so many great restaurants new by!).
The flat is also super close to the metro and bus stops, so you can get anywhere with ease.
My one complaint was that the wifi was very weak and the air conditioning was broken. In response to these issues, the property manager moved us to a larger flat immediately which did have much better wifi. Amazing! The AC was still broken, but we were able to manage just fine. I felt great because management was very responsive to each of my questions and concerns.
Stay here when you come to Madrid!