When I first became vegetarian a friend took me here for breakfast and it was divine! They offer three all day breakfast options including a vegetarian breakfast and a vegan breakfast, and they're pretty easy going with switching things out. Their vegan sausages are to die for! Best I've had so far and I've gotten similar comments from long time vegans. I'm also very partial to their potato cakes and hash browns. They do have a range of other options, and they do specials on Sunday, I've heard good stuff from other friends but haven't personally tried anything other than the vegan breakfast.
They also do good coffee, and they at least have soy milk although I'm not sure about other dairy alternatives. Not the best coffee I've had in Sheffield (I do love my soy mochas) but it's pretty good. This, coupled with a small but tasty herbal tea collection means I can easily spend a day just chilling out with friends here.
I'm also quite a fan of the atmosphere. The walls are covered in bookshelves, I think they're available to buy or just read whilst you're there. Upstairs there's a small intimate room with a vinyl player and a stack of vinyls as well as a couple instruments.
I basically wish I could just live here!
Cons: Closes at 4, Might be a bit pricy