I am a vegetarian who loves vegan food and la pentola vegana is amazing. Their seitan and hummus are delicious and everytime i've been there i found different oppptunities and new dishes to try! All my friends who are non vegetarian love the place too!
The only thing to remember is that the restaurant is quite small, so it is better to call before going. Another thing that may scare some people is that they show you the food, you choose it and then they re-heat it in a microwave: that is not a problem at all, the food tastes really good anyway and they keep cooking it in the kitchen, so it won't lay there too long!
So my final tip is: GO THERE SOON!
Cons: small place, microwave