It was a troubling stay. Because of a snow -storm our flight from Cappadocia got cancelled so we got on a bus, and it arrived much later than expected too.
So we arrived in the middle of the night, and the check-in contact picked up the phone on the second call (good) but didn't speak a word of English (very bad). We had to rely on some passers-by to talk to him, which was pretty stressful in inself at 03:00 am, not to mention the phone battery close to being dead.
After we got in (after going up 5 flights of stairs with two suitcases: I don't mind some cardio, but this detail might be useful for some readers anyway), we found the fuse box to flicker as soon as we turned on the electric equipment (and the problem couldn't be isolated to any particular outlet) -- with visible electric discharges, even. Though luckily without any smoke. There was no hot water either. The checkin instructions mentioned the boiler, but it clearly wasn't working.
By the end of the next day the host (thankfully) took care of the fuse box and improved the water situation. The water still wasn't very hot after that: it was good for a few minutes but then got barely warm. The recommendation by the host (to turn off the ACs when taking a shower) didn't make a difference. What did, as we found out experimentally, is also turning on the tap, in the kitchen or inside the bathroom. That reduced the strength of the flow from the shower, obviously, but made it significantly warmer.
All in all, leaving the guests in the coldest week of the year without a hot shower is pretty unconscionable. We should have paid more attention to the existing reviews.