My wife and I stayed @ Mercury for one evening, and we found the inn to be very nice, although it lacked a few amenities that we had seen at other bed and breakfasts. Our room was a little tight with the slanted ceiling, but the spacious private bathroom was very nice, although it got quite steamy in there. We took advantage of the tea in the communal area, but found it to be less inviting than other communal areas we've seen in other B&B's. No snacks either!
The breakfast was good, with great coffee, delicious bread, yogurt, and a nice baked egg dish. We were a little confused as to why there was no juice or fresh fruit provided.
Overall, we had a nice experience, and cost effective, given the lower room rate than other local B&B's.