Thank you for your opinion, sourcefreelance! Perhaps I didn't explain the service well enough. I don't think that there's a need for moderation in the sense that you explain, since comments the user makes are either notes for the hotel manager or comments for himself. Other users will never see what he thinks about the hotel. I was afraid if we made user comments public, the service would turn into a sort-of
trip advisor where everyone gives their two cents about the establishment (these reviews could be phony or vulgar and, like you point out, would need moderation).
Instead, all user comments are either private notes for themself or direct questions/requests to the hotel (only the hotel owner sees these requests, they are not public).
Comments are taggable, and so the entries will be organized into subjects in this way. I thought this would be easier than setting up a mini-forum for each hotel structure. It will also be possible to rank comments according to their importance so users can remember which comments they want to remember.
I hope I understand your comment about the microblog leaving limited space for specific content. (What do you mean exactly?) Perhaps we could add some suggestions about what to write/ask the hotels so that users have some focus. I am considering expanding the service so that it can be used on any site, not just for hotels, and so at first didn't want to limit the scope. But maybe you're right, users need some direction.
Thanks again for sharing your thoughts!