Lovely apartment. Clean, safe & secure and in a great location.
It is a bit compact and would suit 4 people who don't mind being in close proximity to each other or who just want to use it as a base. Those with a larger disposition (such as myself) would have trouble manoeuvring in the bathroom ;-)
And while this is not a fault of the host, as I think Cars are getting bigger, but we couldn't get our large saloon into the very tight parking space.
Otherwise a good place to explore Madrid from.