E3 and E2 are the rooms used for the lectures. These are both located at Lindstedtsvägen. The best entrance to use for getting to E3 is Lindstedtsvägen 27. Look at this link to see how to get there from the subway. To find your way inside the building, have a look at this link. Or, look at this map to E3.
To reach E2 you can use the entrance at Lindstedtsvägen 1 instead.
Summing up dinner
You can walk to Restaurant Jakthornet from KTH.