Location wise, for a family of four, it was perfect. Enough space for everyone to relax and cool down when not out exploring Madrid. Wifi was good enough for everyone (working, and streaming).
The check-in & check-out process could be communicated better. I do not recall ever receiving an explanation. It would have saved everyone time and phone calls. The only way to enter the building is via a URL on your mobile with location access and data.
Finally, the elevator gave us a lot of drama. Sometimes it was perfect, other times we were stuck and had to go to another floor to be able to exit. Hopefully it is fixed before the next guests.