Maria's apartment is very comfortable and everything in Old Town Sevilla is walkable from here. the heater works very well and we were comfortable anytime we had to turn it on. hot water on demand, and it has a dishwasher and washing machine, very convenient.
Maria was very fast to respond to our questions and super friendly. lots of great sightseeing and restaurant suggestions.
Our only critique is that if you're a light sleeper, note that this is a lively neighborhood on the weekends and there is a lot of street noise can be heard in the bedroom.