I arrived around midnight on a Friday night, and Carmen was very welcoming despite the time. I had messaged her previously regarding my short stay (I had to leave around 7:30 the next morning to catch a flight), and she didn't mind at all - she even woke up early to prepare me a full breakfast and deliver it to my room on a tray while i was showering/getting ready. The room itself wasn't sparkling clean but it was tidy and comfortable. Also, there were two other guests staying at the apartment and she was able to communicate well in English with them! I highly recommend staying with Carmen! Literally a 5 minute walk from Atocha train station!