This is a superbly located apartment a few steps from Madrid ground zero - the Puerta del Sol. You can easily walk to most attractions from here and it is surrounded by eclectic tapas bars and pubs.
The 1st floor apartment is away from the street, with a small window to a light well in the living room and bedroom. This means it is a little dark without the light on , but astonishingly well insulated from the night time party noise in the street outside when you’re sleeping and also well insulated from weather extremes. Despite temperatures of 40+ deg C outside we barely needed to use the A/C.
We used the electronic key system to let ourselves in to the building and apartment during our stay and it worked well. Everything was there that we needed for our stay.
Javier and Pablo were very responsive and answered our questions promptly.
Definitely would stay there again on a future visit and happy to recommend to other travelers.