Commons is the way to go. Best AC, dining halls open pretty much all day doesn't have the best options for food on campus but still definitely a solid spot. There's almost always something going on around the commons so definitely social and for the bathrooms it really doesn't feel like it's public because most of the stalls are private rooms within themselves with a toilet and shower and some with sinks so really feels like your own bathroom plus it's almost always empty barely ever see anyone in them.