For a three-star hotel, there are several things to like: i) breakfast is solid, particularly their home-baked bread, ii) it is across from the Príncipe Pio metro station, next to the Principe Pio mall and a 15-minute walk from the Royal Palace and the Opera. You can take the tren de cercanías from and to the airport, and iii) most rooms looking to the Casa de Campo have a terrace. On the other hand, walls are really thin and you can hear your neighbor do the dirty bird, and some of the maids tend to forget to clean under the bed. Finally, while most of the staff is friendly, a couple people at the front desk could do a bit more. I would definitely stay there again.