I have been here a few times and the best thing there is sitting in the cafe and enjoying a local Floreffe beer and munching on a plate of cheese or sausage slices. The cafe has a few different beers on tap and also those aforementioned snacks. You can also get, to take away I'm guessing, some delicious bread that they also make.
The abbey itself, if I remember correctly, isn't up to much but if you don't live in Belgium and haven't been to many/any Belgian abbeys, you might like this one.
They also have a gift shop with stuff that you probably don't want to buy but hey, even monks have to make a living. read more