We stayed at Nienke's place for a couple of nights on a weekend trip to Amsterdam. The accommodation is beautiful and well located, just 15 mins from Centraal Station. While the studio does not have a door, it is separate from the rest of the house and feels private (it's worth noting that it is up a very steep staircase, however). Nienke was a great host, very responsive to questions and had kindly left food and drinks for us upon arrival. We would highly recommend Nienke's place and would certainly stay again.