London 3 days
Munich 4 days
Berlin 4 Days
Copenhagen 2 days
Brussels 2 days
Paris 3 days
Nice 2 days
Vienna 3 days
Barcelona 2 days
Madrid 2 days
Zurich 3 days
Zermatt 3 days
Naples 3 days
Florence 2 days
Rome 3 days
All of this excludes travel time, and just time spent in the actual city.
Is there anywhere I should add or remove, if so why?
Money is not an issue
As has been previously mentioned December/January really isn't the best time of the year to travel. Nevertheless, I think you're spending too much time in places that really aren't worth all that time and too little time in places that deserve more time. I think you shouldn't spend so much time in Switzerland (especially Zermatt) unless you plan on skiing for a couple of days; you could spend a day in Zermatt and two in Geneva for example. You might want to go to Liechtenstein too.
That's ambitious for December/January when you can expect bad weather. It's also not a very efficient order to see places in. You have a lot of travel days scheduled. I'd probably pick places that are closer together and plan day trips from a few bases.
If you plan to stay in hostels or budget hotels check them out before you go. A lot of hostels and hotels close over the winter season.
Three days in Zermatt ? If you dont go ski, it seems a bit Long.
Too many destinations. Too little time in bigger cities.
