We had a first floor room (109) in the main building with 2 queen beds. There isn't a better view in Bar Harbor. The staff is excellent even providing complimentary valet parking.
We like to be lazy on our vacations and Bar Harbor Inn serves complimentary breakfast until 11:00 which suits our style. It is a couple of buildings away from the main building but with the weather in Bar Harbor you won't mind. One morning I walked over and picked up some fruit and muffins and brought them back to the room.
It's just a short walk up a slight hill to Main St. and any kind of shop or restaurant you would want.
They advertise free Wi-Fi but I had trouble with it the the entire time of my stay. They even brought a hot spot into my room to improve the signal but signal strength was not the problem. Clearly they have some kind of problem with their infrastructure. I tried using my phone's hot spot but the LTE speeds weren't very good either. Set your expectation with the front desk and then just be patient. It's really not acceptable for this level of hotel.
Their web site is here and their reviews on TripAdvisor are here.