Since you are going to spend a lot of time here, you will discover much more places than the average tourist. I warn you that maybe you don't find many of this spots interesting or... that you prefer them to the turistical ones! Some of them are unknown even for the locals!
Many places like the I Love Bratislava graffity are just 1 minute away from the tourist stream, but if you don't know the exact location, it can be months until you finally find them.
Of course, there are many other spots! Want to see your favourite corner here? Contact me and I will publish!
This is the definitive guide for a Erasmus or a Student in Bratislava, all info I know about the city will appear here