You would have to ask him about privacy. In general, he would have access to anything that goes through his router, server or whatever the setup is.
I have only a question. I am being hosted in a friend house where actually there is a wireless internet administrated by a guy leaving in the same building. He runs his own business selling this internet connection then he gives passwords and everything. I was wondering which is the grade of privacy. Will he be able to see all the site where customers brows, all their activity and so on? I could know basically (if he wants all the activity of the people connected to his network, including commercial, entertainment or sexual behaviors and preferences...). In this case which is the grade of privacy if he basically runs everything and for security reason he is in theory authorized to step deeply in the other people's privacy?