My partner and I might be going to a conference in Florence in late January; we are considering staying with family in London beforehand and driving, if we can have that much time away from work. I've looked at ViaMichelin, which is supremely helpful, but we're also interested in experiences, recommendations, etc. We probably don't have lots of time to make detours, but we do plan to be a bit leisurely about it. Also wondering about return trip - is it really expensive to drive one way and leave the car? Thanks!