Before getting in you are asked to come to an office 15mn from there (still in the centre) to pick up the keys but mainly to pay the city tax by cash at the cashier. the guy and the tram were really friendly and full of explanations.
The flat is very big. 10 beds. we were really surprised of all this room and cleanliness.
Not really suitable to cook for 10 people (it seemed to miss some cookware). this is more a flat to spend 2 or 3 days and eating outside I guess.