I rented the apartment in winter so this might not apply if you are getting it in summer - the apartment was cold as the AC heater didn't work. The electric heater took about 4 hours to warm up the flat. It's also worth noting that this is an old apartment which allows only 2 electric appliances turned on at the same time. It's not the host's fault, it's just how it was built back in the day. Not being used to it, I've found it very limiting and running around the flat turning things on and off so the fuse box does not blow each time.
Other than that, the hosts were very nice and accommodating. When they fixed the heater, I'm sure it's going to be a much better experience.