the location is great and it was really nice to have a sauna!
Windows in the bedroom were really leaky even when closed and we heard loud "woosh" noises every time a car, truck or van went by that kept us up when trying to sleep.
Our stairway neighbors were nice and tried to be quiet when they came home late but the seals on the doors between the unit and the hallway are non-existent so you heard all of their steps and even quiet conversation like they were in the room with you. Light also leaks through the doors from the hallway.
The kitchen vent makes the unit stink of rancid oil when used.
The low amounts of hot water situation is silly partially because the water pressure is so good. If you put a lower flow shower head on (one that cuts use in half) you'd get twice the time out of the water heater. I found a number of shower heads on Swedish Amazon that would accomplish this for around 300 kronor.
If you wanted to improve the situation further, the water heater has an option for 400v that would triple the rate at which it reheats (currently 1 kW on 240v, could be 3 kW). This would be more expensive and harder than the shower head. Also I'm not sure if this is possible or not given the location of the water heater and electrical situation in that unit.
The bathroom handle fell apart the first time we touched it. This has likely been an issue for other guests. I think all you needed to do was put some blue thread locker on the set screw (missing because it's likely fallen off so much) so it wouldn't fall off.
The bathroom floor tiles are completely slick and there is no bath mat that we could find. Tiles are sold that are a little roughed up for wet traction or a bath mat could have been included.
The bathroom floor is not all pitched toward the drain, so water will run towards other parts of the bathroom that aren't the drain.
The sink basins are growing mold where water slashes back onto the bottom of the counter top.
The sink cabinet fronts have gotten wet over and over again and the paneling is starting to separate.
The heating radiator in the bathroom does not work.
There is black-colored mold growing in the corners of the shower glass and the tile grout.
The bathroom fan does not work.
The chest in the living room used to sit on a rug but does not any more and people before us moved the chest around on the wood floor, causing deep scratches in the floor.
We did not notify the hosts of these issues while we were there because most of them seemed like they had existed for some time and we're not of concern to the hosts.
The pictures were all taken when the unit was recently remodeled (I'm not sure how many years ago) and do not reflect the current reality of the unit.