For $325 per night they could at least provide two bottles of water to a room with two people occupying; one was provided, and this was chintzy. The breakfast, while good, was basically a continental breakfast with a single hot casserole, which differed both days. How about breakfast meat of some sort? Turns out they did do eggs any way you want them; we didn't find out about this til after the first breakfast (information not voluntarily provided).
Bathroom was very small, no q tips/cotton balls, mag mirror etc. Hair dryer was minimally adequate. I have had these amenities provided in several high quality bed and breakfasts I stayed in, and many were less than $250 per night (including one in Cooperstown New York, the home of Glimmerglass opera, which is a comparable venue to Tanglewood). .
The Keurig was a nice touch, but there were no mugs to put the coffee in (at any time that we looked for them; ended up taking some from the dining room), and no "to-go" cups, which would have been a nice service.