Authorized,
To begin with, as this is your first trip to Europe I would highly recommend reading Europe Through The Back Door prior to your trip. It provides a lot of good advice on how to travel in Europe. I gather you're already using the RS country-specific guidebooks, which is also recommended. Your profile doesn't indicate where you're located, but also keep in mind that you'll generally arrive in Europe the day after you leave your home airport.
I haven't looked at your Itinerary in detail, but a few thoughts based on the last version that you posted, which looks very reasonable......
- Rome - 3 nights is a bit short, as there's a lot to see there. However it should be enough to allow you to see the main sights. I you have the RS Italy guidebook, be sure to have a look at the section on skipping the lines at the Colosseum and other attractions.
- Florence - I'd recommend a change in the order of cities - go to Monterosso after Rome as it's a reasonably short trip and a more efficient route. There are direct trains from Roma Termini to La Spezia Centrale that only take about 3H:45M, and the train from La Spezia to Monterosso is only about 15 minutes. Three nights in Monterosso is good but I would highly recommend getting accommodations booked soon! Is there any way you could add at least one night to Florence? It's a great home base location for day trips in Tuscany, such as Siena, Lucca, etc.
- Monterosso - three nights is about perfect. It will give you time to not only enjoy the five towns, but also do a bit of exploring to other nearby towns such as Porto Venere, Levanto, etc.
- Venice - two nights should allow you to cover the main sights, but be prepared for "hot & crowded" in July. Don't sit down at the posh cafes with highbrow orchestras playing around Piazza San Marco and order a coffee or whatever, as it will be extremely expensive!
- Füssen - rather than stay two nights there, I'd suggest adding one night in Munich and one night in Berlin. You can easily see the Castles on a day trip from Munich, either on your own or with a firm such as Radius Tours. Visiting the Castles requires a time-specific reservation and if you go on your own, you'll have to take care of that.
- Munich - this is a great home-base location for sightseeing in that part of the country. It's a very scenic city with lots of history, and you could also take a day trip to Salzburg or Berchtesgaden. If you think your children could deal with it, you could also take a tour of the Dachau memorial. The Deutsches Museum in Munich is incredible, and one could spend a full day there!
- Berlin - there's also lots to see here, so I'd definitely recommend adding at least one night.
I agree that skipping Denmark would be a good idea for this trip. It's somewhat of an outlier, and going there will reduce your already short time in the other cities. Paris would be nice to see, but I'm not sure you have the time.
Keep in mind that each change of location will require about half a day and sometimes a full day, depending on the specifics. Checking in & out of hotels, travel to the stations, waiting times, etc. all adds up.
You'll have to do some research on using the various rail systems. Especially in Italy, there are some potentially expensive caveats to be aware of when using trains and other public transit. If you need any information on using the trains, changing trains, buying tickets, etc., the group here will be able to provide lots of information on that.
Have you researched things like travelling with electronics or appliances, Plug Adaptors, using credit or ATM cards in Europe, etc.?
Good luck with your planning!