Nice, clean apartment with functional kitchen. Súper nearby Parque de Retiro and well connected with Metro stations. In less than 20 minutes you are already in Puerta del Sol. Nice neighborhood. Great communication with the admin.
The space is quite reduced, I would say around 16-19 m2. It worked for us (a couple) but at moments we felt like we had to go out to get some air. Have in mind we were there with 4 25kg suitcase + 3 backpacks and we were mostly inside and working. I think it is the perfect place if you come for tourism, plan to be out most of the day and just need a nice, clean place to rest in between.