I’d contact the Uni, a letter from the Uni normally scares them more than a letter from anyone else and letting agents are generally complete and utter you know whats to students and I wouldnt wish that on my worst enemy.
I’m half smiling and half cringing at some of the things mentioned here remembering my students days. We used to have a firing range set up in our garden in one house and the targets ranged from old frying pans (made a great “ping”) to mini lynx cans hidden in gnomes and surrounded by a ring of burning paper so when the pellet pieced the can it shot off somewhere. I remember once in summer coming back to find a load of complaints from our neighbours about “the blonde one” urinating out of our living room window onto the street. He had gone away so it was up to me to go round the neighbours and apologise, the worst part is that outside of our living room window was a grill with a light well down to our kitchen window…
We used to get shouted at by the local old biddy for playing house games of Unreal Tournament on our network (ahh the days of the first thing I did to a student house was install a cat 5 network to all the rooms) with the windows open.
I’d like to say the neighbour annoying parties died down when we bought our own houses as post grads but nope.
I’d agree with the above that they may just not realise how inconsiderate they are being though. They will just need a reminder from the Uni to calm down. the Uni may not have their addresses/names on file yet though if they have just moved in but they can always find the agent and go that way if the first one doesnt work.