Dear Marcello and Raffaella-
Thank you for wonderful trip!  I really enjoyed meeting you and appreciated all of your efforts to make my trip to Italy special.  Although my visit was fairly short, I had a great time and managed to do a lot.  It was great to meet your family and to have dinner in your home two nights--I was looking for an authentic experience and I certainly got one.  Your kindness and warm hospitality really meant a lot to me. Even though I didn't use the sliding door ;) , I really felt at home and it seemed as if I had known you for much longer than a few days, which really says a lot.  I can't wait to try out my new recipes for my family.  I will be sure to report back!
I hope to see you again soon. Thanks again for a fantastic experience in Bologna.