Haven’t yet, but am this year. We rented a condo in Fiumelatte that is right next to the station. can only go on Sat. & Sun. The earliest train on Sat. is about 6:30 and & 7:30 on Sunday. Takes about 1hr 15 minutes to Monza.
As far as Varenna, I believe there is a train around 6:30 on Sunday also. If memory serves me correct, on the 6:30 trains you don’t have a connecting train in Lecco. The ones at 7:30 you have to change trains in Lecco, but it is a quick stop, but enough to where you shouldn’t have to worry about the connection. Varenna is kind of split in two sections, and the train station is in the section where the ferries dock, next to Hotel Oliveda. We had actually booked there, but had to change as we have a friend coming from Germany & they didn’t have any triple rooms available. if you haven’t booked yet, Lake Como Homes is a good site to use if you’re interested in a condo in the area. The link is the unit we rented, but they have several others in the area. They were very easy to work with. http://www.lakecomohomes.com/view/Bella-Fontana-.aspx