Yes they can. When you moved in you probably signed a contract stating that your room may be searched at any time. When I went to college I know I signed it.
I think it's a great idea. It gives the public a glimpse into the world of police work and the dangers that officers encounter. It also gives officers a chance to interact with civilians on another level and give some helpful knowledge.
Don't use a cell phone. Make sure you are prepared to answer basic interview questions. I would also be the only one in the room, so make sure no one else is there. Just make sure your are professional and be yourself.