We stayed here for las fallas and the location was perfect -- close enough to walk to everything, but (a bit) quieter once we returned to the apartment for the night. It is even near the fallas museum if that interests you. There were grocery stores and restaurants nearby and it was only about 15-20 minutes walking to the main train station/start of the town center.
Marcos accommodated us with a late check-in when we encountered an unexpected traffic jam and closed streets due to the las fallas festival.
The house is big enough to comfortably fit four people and is pretty much exactly as it looks in the pictures. It is very nicely decorated with a large comfortable sofa and artistic photographs. During our stay there was a problem with the shower (it did not drain properly) which required particularly brief showers and sometimes caused water to spill onto the bathroom floor even when we were being careful. It seems this may have been a problem for a while because the apartment had a faint smell of mustiness/moisture, but we notified Marcos about the drainage issue so hopefully it will be fixed soon. Other than that, the place was perfect.