Maria is a wealth of knowledge in the lead up which is terrific for first time visitors. The location is walking distance from so many amazing locations in Madrid. There is no wifi, so research in advance or visit the nearby markets for a reasonable connection.
Maria is big on ID. Being honest, it made us slightly uncomfortable having our passport number recorded. ID I understand is important but unlike a hotel, there is no clear reason why it should be written down.
Nonetheless, would absolutely recommend staying here for couples especially.