Take a look at the handwritten menu before entering as you are not given a menu once seated (there is one hanging on the wall near the kitchen as well). Next, be prepared to sit with other diners, and finally, get ready to eat some of the best food you're likely to ever eat for a super cheap price!
We went two days in a row because it's just that good. Both days, we got the pollo arrosto and non-meat pasta of the day and quatro litro of wine. The first day we were lucky to get one of very few portions of sauteed spinach (mouth watering) before they ran out. The couple who were seated with us ordered maybe 5 min. later and it was already gone (and the restaurant had just opened).