We did, b/c the 2 bedroom apt they own was full with other Parents. When one of them moved out and headed back to Moscow, we 'moved-in'.
We slept in their L.R. on a pull out sleeper/sofa for a few nights. We shared B-Fast and Dinners with them. As for Russian Food / Restaurants, She had 'checked out' Restaurants that were 'clean' for Americans to eat. We had no problems, no stomach issues, all was fine. Be sure to order drinks that don't require ice cubes or a cold bottled or canned drink.
Our agency told us that She was the only one that spoke English, her DH and other Relatives did not, but that didn't mean they wouldn't understand what you would say. Just be careful what you say, you never know.
We really got to experience the full Russian Culture and thought staying with the Host Family was great!
Good Luck
