We are a family of five and stayed in Humpy Dumpy for a week in August. We had a wonderful time and loved the houseboat which was beautifully decorated, well equipped, and spotlessly clean. There was plenty of room for five (two adults and three older children) and we appreciated the space to sit outside and relax while watching boats on the canal.
The village is quiet and pretty, and people often waved as they walked or cycled by.
We also took the train to Amsterdam a couple of times, and explored other towns such as Edam and Hoorn by car.
We would thoroughly recommend Humpy Dumpy - it is a real find!
It may be worth pointing out that it would probably not be suitable for the infirm or families with very small children because of the steep steps leading up to the houseboat.