We really enjoyed our stay in Heidi and her family's house. More than enough space for five people. Two newly renovated bathrooms and an extra toilet too. I suppose it could easily house an even larger group than ours and then be even better value for money.
The house is typically Amsterdam, has a lot of "soul" and is beautifully located by a canal. The location is perfect, close to Nieuwmarkt and walking distance from most sights. Three balconies and a rooftop terrace all facing the backyard make for a perfect hangout after a day of sightseeing.
Would definitely stay again if visiting Amsterdam in a group.