One from column A, one from column B person here. I use both electronic and paper, more of the former than the latter. I would not get both an electronic and a paper version of the same book. I would use the electronic version along with any number of other online sources to decide where I wanted to go and make a paper or electronic list, perhaps with the RS page numbers or book location depending on how your device works.
I used to take a flip phone, a digital camera, a Kindle and some paper printouts or pieces of books on our trips. I find my Kindle too heavy now that I have a smartphone with the Kindle app. With the abundance of Wi-Fi, my smartphone will be all I carry until something better (not bigger) comes along. I resisted a smartphone for a long time, but I love the versatility of being able to use one device to replace 3 other devices and being able to load books on it both for travel and casual reading. I also love being able to use email and text messaging and the phone as well as the camera. We set up global discount options with Verizon for our trips. We do not use data roaming. It's just too expensive.
With Wi-Fi in our room, I can locate myself and find directions to where we want to go from the hotel. I can save those and use them offline, but sometimes I just write the address down. I'm more of a big picture person, so I typically purchase a laminated Streetwise map (on sale now here at the RS store) if one is available for where we are going. Most of them have the detail I prefer, including streets, transportation stops, major tourist sites, a street index, etc. I see that there are ones for Milan, Florence and Rome. I highly recommend them.
My husband takes his smartphone, but rarely uses it. He is addicted to his normal size iPad which also has the Kindle app on it. But he only takes the former, never the latter when we leave the room -- unless we are going to do something fun like laundry. Most of the laundromats or cafes near them seem to have Wi-Fi if he wants to use it rather than just read.
If you do decide to get a paper book, don't cringe about cutting it up. That's coming from a retired librarian. Most books are carriers of information, not sacred objects. The easier for you to get at that info, the better.