With all the online booking sites these days, it's tough to know where to start when looking for a unique place to stay that's not just trying to dump its last-minute inventory. I find these online tools incredibly helpful when looking for a charming B&B or small, locally owned hotel in Amsterdam.
Part of the "WorldBy" family, this site does include hotels of all kinds, but offers a comprehensive inventory of B&Bs, residences, apartments, townhouses -- basically any type of accommodations you can think of. The photo galleries are extensive and help travelers get a real feel not only for rooms, but also for surroundings and common areas.
WeekendHotel.nlWeekendHotel.nl prides itself on helping travelers find Amsterdam accommodations with more charm and character than the typical chain hotel. Most listings here are boutique/design hotels or locally-owned bed and breakfasts.
Venere.com acts as a liaison between travelers and more than 100 Amsterdam hotels and accommodations. In most cases, the site does not require immediate payment, unlike many other hotel booking services. While Venere search results do include large chain hotels, they also feature B&Bs, apartments and residences.