Q. A person is looking for places to eat on Shabbos is there any prohibition to tell him which families tend to have guests or which ones don’t and it is better not to ask them?
A. Horav Shlomo Miller’s Shlit’a opinion is that you may tell him which are the families that welcome guest for Shabbos. As far as the ones that don’t, if you have to tell, just say that you believe they are unable to do so.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a