Basically the apartment is good. Enough space for up to 10 people. The room with the 2 single beds has no door to the main corridor of the apartment so you have to deal with the noise of your friends when they are going to the toilet etc.
Unfortunately during our stay the heating system was not working, mobile heaters were provided but not enough for the size of the apartment. Also the stove was only working with 1 cooktop (out of 4) and the main safeguard was always kicking out during cooking or when using the kettle. This was not resolved during our stay.
If you wanto to cook with a large group you have to consider 2-3 runs due to the limited equipment of the kitchen. There are unfortunately only very small cooking pots. There is no salt or pepper or cooking oil for easy menus in the kitchen, you have to buy everything.
Also, we stayed there for 4 nights (10 people) and there was only 1 dishcloth provided for cleaning all the dishes.
Furthermore you have to buy your own toilet paper, only 2 rolls for each bathrooms were provided for the complete stay.