BOS lounge is awful. Apparently it's due an refurb soon but if it has not happened yet you'll be in a windowless basement room, with dated furniture and half the power plugs not working. I'm not talking about the First lounge which I haven't experienced.
On the breakfast front: they seem to offer small pastries but I have yet to not find the tray empty. There is also a couple of jars full of cookies, and that's about it. so aside from coffee/tea and fruit juices you won't get much of a breakfast in my experience. The last couple of times I bought a sandwich in the terminal, went to the lounge to sit down with a hot drink, then just went back upstairs to sit by the big windows..
The BOS lounge is the worst I have seen in my limited experience..