I have worked in the area for many years, and there is certainly no shortage of places to eat near Piazza Alessandria. I discovered Mattacchioni about 3 months ago, and since then they have become my favorite place. They make express dishes, you have to wait a few more minutes but you don't eat pre-cooked pasta (and you can definitely feel the difference) the quality of the food is excellent, for example the bacon in the pasta is amazing. They are very kind and also cheap, for lunch there is a menu with a first course (excellent), a side dish, water, bread and coffee for NINE euros. I had a full lunch once with my family and we had a great time.