Nik's apartment is ideally located in the city centre, within walking distance of anything you may need (less than a 10 minutes walk to most of the restaurants, Amsterdam Centraal, the Dam square...).
We were able to leave our luggage in the apartment when we arrived the first morning while the cleaning was being done, same for the day we left (we had our plane in the afternoon).
We highly recommend staying at Nik's apartment if you plan on spending a few days in Amsterdam !