The access to the apartment is extremely easy from Central Station and hence from Schiphol airport as there are approx 5 trains per hour connecting the airport to the Central Station. It takes only 5 minutes walking approx 400 metres from Centraal Station to reach the apartment entrance. The entrance of my apartment is at streetlevel and via stairs to the first floor.
The Nieuwmarkt area s extremely Right in the heart of downtown Amsterdam and the red light district.
Smoking and any type of drugs are not allowed in the apartment, apart from that you are pretty free of doing what you want anyway I value kindness and not too much noise or loud music at night, also thinking about the quietness of the neighbours!