Apart from issues with check-in (there was no key deposited in described place when we arrived), everything else was ok. After calling Tania, we got the keys in 40mins waiting outside in cold.
Another small point was probably the expectation that one trash bag will work out fine for 3 people for 2 weeks.
Otherwise flat is great especially if you travel with small children, as there is bathtub and washing machine inside the flat. Nice location close to the lake.