Question Looking for Hotels/B&Bs with Triple Rooms in Amsterdam, Haarlem, or Delft

We're planning a trip this summer with our 22-year-old son and are looking for accommodations that offer triple rooms in Amsterdam, Haarlem, or Delft. Normally, we'd book two rooms, but we're hoping to find a place that can accommodate all three of us comfortably. Does anyone have recommendations for hotels or B&Bs in these areas that offer triple rooms? Any insights on the best areas to stay in these cities would also be appreciated. Thanks in advance for your help!