The location is fantastic, the check-in hostess was professional, and manage to found me even when I was standing in front of a different building. (there are 2 building with the same street number really close to each other, despite they are different streets.) The building is right next to Gran Via, and easy walking distance to majority of the sights I want to see. You can see the Lion King musical theater with less than a minute of walking time. However, it is slightly amusing the elevators doesn't align with the floor height, so if you have a wheelchair or heavy luggage, you might want to hold off on staying here, as you either need to go up or down half a floor to reach the elevator. The only other slight inconvenience is the short showers, hot water only last for ~5minutes in shower mode and then have to wait ~2 hours for it to heat up.
I would definite stay again since I know what to expect. (I shower quick anyway, can't say the same for the wife.) Make sure you check the battery of your keys before the hostess left. (we found out one of the key had no battery, so we are down to 1 sets of key instead of 2 during our stay) The customer service team reply fairly quick.
Overall a pleasant experience.