Make sure you are exact in your requests and descriptions of the place. I tried to do an early check-in and it wasn't communicated properly to me that I couldn't do that. I was then blamed for her own lack of understanding of me requesting an early checkin and was literally left finding a place to put our 50 pound suitcases.. She does respond quickly which is a plus.
You also need to hit a hot water button and wait 15 minutes for water that never ended up getting too hot.
Lastly, the power is off while you are out of the place so trying to run the AC or anything like that when you are gone is not possible.