The shower took about half an hour to heat up, and when it did it was either scalding hot or freezing cold - it was impossible to get it at an even temperature.
We weren't informed before arriving that the shower would take a long time to heat up.
The bathroom smelled of mould and was very unclean.
The kitchen was also unclean, and several dishes weren't cleaned properly.
The whole flat smelled like a combination of cigarette smoke and mould - there were a lot of candles around the flat to mask the smell, but it permeated everything and stuck to your skin.
Both of us got chest congestion while we were there, most likely due to the mould issues.
The apartment isn't in a state where it should be rented out to people.