Just make sure that you're aware of the signal if you're at a VC sponsored space. If Polaris passes on you when you're raising money, it can be exceptionally hard to raise money. Even if you get one hot and bothered, other VCs will think "what does Polaris know that I don't know since they know the company better" and they'll go against their judgment and pass as well.

That said, the Cambridge space is, indeed, wonderful and the community there is quiet but intensely driven. And, yes, free coffee.