Great, thanks all, we now will choose from one of these hotels.

Radison always has bus tours staying there. Havent seen the rooms but think it would be a fine choice - nothing special, but certainly acceptable on the edge of many great neighborhoods. See if you can get a room overlooking Charles St with patio.

I have stayed in the Radison for medical visits, using Priceline. It has a low ceilinged lobby that is not impressive, but the rooms are nice and the views excellent, even on the "wrong" side.