The largest UniCafe cafeteria has the most varied range of dishes available on any given day, usually one or two vegetarian/vegan options, a chicken dish and a red meat dish. There's a lot of space but of course, due to the location and lunch list it's crowded during the students' lunch hours (11am-1pm), and around 4pm.
The new University Main Library is huge, the architecture is modern and fresh but not intimidating, it's got almost all previously scattered university libraries in one place, there's an honest-to-God terrace on the top floor, and the café on second floor is comfy and a great place to study if you need a little background chatter to concentrate.
Thai Orchid Itis is situated in the Itis shopping mall, formerly known as Itäkeskus. It has a gorgeous variable buffet (sushi included) available every day from noon-ish till late afternoon. Pricey on the weekend in comparison to others but well worth it.
It's a pub where the beer is so cheap the only reason they're in business is because people come to get a good buzz going before continuing somewhere else. Friendly staff and clean toilets, but I wouldn't recommend spending your entire evening here.
There is a ton of science fiction and fantasy books in English in the back, especially older SF but the odd newer book does turn up. Some translated SF&F as well. Highly recommended for browsing even if you aren't looking for anything special.
Due to its location, Sofia has a pretty good selection of academic literature on a wide range of topics in the back room (linguists especially are encouraged to visit), but they mainly have a lot of fiction and non-fiction.
The traditional gathering place of English Majors due to its location; has an excellent selection of both Finnish and imported beers/ciders, friendly and quick staff that know their products, and lots of space - although the pub can get packed on the weekends, so make sure to arrive early if your group is larger than four - that's divided into the (relatively) quieter side and the other side where sound carries better and the music is a tad louder.