We had an awful experience since we didn't have hot water during our whole stay. We told the landlord as soon as we realized it, and she said it was a building problem. But, as it happened during the weekend, we waited until Monday. So, days went by, and the owner never resolved the issue.
As we paid a fair price for the flat, I expected everything to be up to par. However, I asked the landlord for a refund, and she refused to do that because she wasn't aware in advance of this problem.
One day before our check-out, she offered to send someone to the apartment in the afternoon. I refused because we weren't there and didn't want anyone to get into the place. And most importantly, we suffered from not having hot water for the past six days (and addressing the problem so late wouldn't make it for us).
Apart from this, the apartment was dirty. For example, the fridge had food and wasn't clean in advance.
Overall, it was a bad experience; we don't wish anyone else to experience it.