Perfect location, we were really happy to be close to the Prado museum, botanical garden... all easy to walk to. The appartment has a lot of nice equipment (nice cutlery, tea, coffee, extra blankets...). The only thing is that the neighbours upstairs were quite noisy every night, we could hear lots of people walking around, laughing, moving chairs etc. But this is obviously not the host's fault and they can't do much about it! But just a warning you might want to bring earplugs.
The check-in was great and flexible, thank you again for waiting as my bus was late!