For mid-coast, first thing that comes to my mind is - Camden/Rockland or Boothbay Harbor.
We had a pleasant one night stay at the Fisherman's Wharf Inn in Boothbay Harbor this past July. It's location is convenient for walking around downtown, and the view from our room was great. The pictures on the website are very accurate. So you can pick the exact room that suits your needs and tastes.
If you visit Boothbay Harbor, don't miss the Botanical Gardens. They are lovely.
Comfort Inn in Belfast has an indoor pool and an ocean view. Belfast is only an hour and a half from Bar Harbor, though, so if you're looking for a midpoint, you may want to look toward Damariscotta if you're coming up the coast.
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