Together with a friend i spent three nights in Marijkes room. She was very kind, considered our arriving-time and gave us everything we needed. Having breakfast in her garden was really a great start in the day!
As you can see on the map, it is quite a walk to the center/Amsterdam Centraal, but there are trains and busses running even at nighttime.
Although Marijkes offers a room for three persons, i guess there will be not enough space for luggage and stuff for three people. But i am sure that Marijke will make everything possible to give you a comfortable stay!