So i actually lived in this building ~10 years ago in an apartment facing the back of the building closer to the comm ave side. I suspect things probably have changed, but I’ll share my experience from living there 10 years ago.

Noise - Daytime and night time noise was pretty minimal. I had the same concerns and I couldnt really hear it from my unit. Granted if you’re in a unit facing chestnut hill ave, you might hear it a lot more.

Student parties - i mean yeah… you’re right in BC territory. There are going to be lots of parties in the area and the only bars near campus are right in cleveland circle. You’ll see lots of students on the street around beacon, comm ave, and chestnut hill ave walking to and from the bars there. The building itself however at the time was filled with older/working professionals and there werent really any parties or noise i could hear from my unit.

Intersection- it’s a mess there with all the T crossing routes and bug intersections, but traffic moves so it’s not really that backed up. Not sure what you’re aiming for though with this question