Large apartment, plenty of room to use and storage space for your stuff. Full kitchen and bathroom, all clean.
Even though there are windows in every room it is not very bright since all windows look at an inner patio.
Location is perfect, 2 blocks from Atocha train station. Neighborhood is fine.
Communication with the host is done thru the Airbnb site, there's no direct channel (e.g. Whatsapp)
Concierge at the entrance is ver friendly, ask him anything you want to know about Madrid/Spain.