I ended up leaving earlier than I planned, just as I reached the upstairs Baroque stuff, which was frustrating, but it was okay because the museum is free, and because my friends had called telling me they were getting coffee, and I wanted coffee, and too see them (obviously).
I've come to a decision about "coffee" in Europe. Before I left, everyone was always telling me that, "Ooooh, coffee in Europe is so great!", but actually, that was a lie, because they don't drink coffee here, they drink espresso, and it's expensive as well as gross. But the latte I had at the cafe with my friends was amazing. What I really have been wanting is a cappuccino, but I can't find one for less than 3Euro50, PLUS I ordered one at this brasserie the other day, and they gave me espresso with WHIPPED CREAM on top, and ever since I've been kind of paranoid.
In the mornings (and, sometimes at 11AM, and then also at night) I make coffee with the French press that I brought, so at least that's okay. But the other thing is that it's hard to find regular (i.e. non-espresso) roasts in the supermarkets I've been in. I've been making my French press coffee with espresso, and that actually tastes fine. It just means that whatever immunity I had to caffeine before I came here is not going to disappear anytime soon.