We have stayed one week at Marjolein's apartment.
Marjolein welcomed us warm, well organized and clearly explained house/rules and advised nice places to enjoy Amsterdam.
House is very clean and had everything what we needed. Nice bathroom and good Wifi. Location was great as it is close and easy access to Volderpark, Leidseplein, city center also quite safe and confortable.
I'd definitely stay again and recommend her house to stay in confidence.