score:7
Yeah, the commute looks ok to me.
The Stockholm Journey Planner gives travel times of about 19-23 minutes from Sundbyberg.
I used Sundbyberg centrum and Isafjordsgatan 39 (where SU's DSV is located, with other universities like KTH very close by). Try it for yourself using the exact address of your campus.
In fact, we're talking of a distance of about 6 kilometers, so your best betβat least when it's warm outsideβmay well be bicycle. (Most likely it's less than 6 km by bike, as I imagine you can cut through the forests/fields near Ursvik.) If you're going to be studying there for a while, buying a cheap bike makes sense.