We visited Bar Harbor with a 13, 12, 10 and 2 year old. The location was great -- a short walk into the center of Bar Harbor, and a quick drive to Acadia National Park.
The bathrooms was good. The downstairs one was just a half; the upstairs had a shower and we had no issues. The one major complaint was the mattress in the master seemed like it was 30 or 40 years old. The pillows also had no substance. So our nights weren't very comfortable.
Overall though, the place was good for the price - a new mattress would bump it up to very good to excellent for the price.
Also, we brought a child's gate for the stairs which worked fine for the little one. I would recommend doing that. more