We've stayed at both Hinckley and Mears - both a few years ago. You are right - Oxford is very walkable. Hinckley is a little closer to the center of town. Mears is closer to the Highland Creamery Ice Cream shop. Not sure if that will be open except on weekends this early in the season. Pools probably aren't open either. Both are old fashioned places. As Gladrags1 said Hinckley's main business is servicing yachts. We were there 3 or 4 years ago and at the time they were friendly and helpful as was Mears 2 years ago.
1991 R22 Fretless
Rock Hall, MD
At this time Highland Creamery is only open on weekends...