Everything is handled by an agency so you check in and pick up the key from them. They're located close to the apartment. But you receive the response pretty fast from the host if you have any questions. The apartment is just like how the photos look like and it's very clean! You're right in the city center where the supermarkets and metro are close by. The only thing to take into account is that there might not be cooking oil, salt & pepper, soaps and laundry detergent.(if you need them, of course.) Make sure you communicate with the host beforehand. Other than that we enjoyed our stay!