The walls are not sound proof. I stayed up all night. No exaggeration, you can hear the snoring in the other room.
The thing is that everything is great but he kinda divides one apartment into two small ones that he then rents out. One of them has the washroom inside of the apartment, the other on the outside. The wall in between both is paper thin. You can hear EVERYTHING.
Especially when they open the door or close it, its super squeeky. I could even hear the other guy brushing his teeth and singing to a Christmas song at 5 AM in the morning.
Other than that, very clean. Very small though. Acceptable location.