After stumbling across Naturalis more or less by chance, I have been there several times now. The café has a nice atmosphere, the decor is a bit quirky and they have a few tables and chairs outside too. Their breakfast menu is quite varied, including a vegan English style breakfast and several vegan muffins. The vegan muffins and cake come from Manna, which are excellent. If you don't know them, you may have to ask to make your choice as they are not labelled as vegan (everyone can eat vegan cakes, why even say). Only been there for lunch once so far. Had the burger, which was a bit too dry for my taste. Will have to try something else next time.
Updated from previous review on Sunday June 08, 2014
Cons: Vegan spinach burger bit too dry