I used to eat and drink here all the time when I lived in Nottingham. They have a great range of sandwiches, which are good value, and a few decent mains. The smoothies are pretty tasty, too, but I am sure not very healthy! The deserts are REALLY good! Especially the regularly changing experimental vegan cheesecakes.
I agree with the negative comments, though... The place CAN get a fair few posers, and the ethics are a little questionable. I doubt they have changed their supplier since Swedish Glace was taken over by Unilever, either. The owner is a meat-eater in it for the money, not the ethics, after all.
If veganism to you means more than just a diet, you might have a better time at Aubergine Nottingham, but if you are stuck for a vegan snack or fancy a naughty treat in the middle of the day, the Alley Cafe is a good option.
Cons: inconsistent ethics, not a veggie company