Where should I go with my girlfriend of 5 years who is interested in italy and switzerland
Italy and Switzerland together is one of the great travel pairings, you get the warmth, food, and history of Italy alongside the precision and drama of Switzerland, and the two countries share a border that makes moving between them genuinely easy. The question is really about what kind of trip you want, because both countries have a wide range of registers.
For Italy, Tuscany remains the classic move for a reason. The combination of great food, beautiful countryside, and a manageable pace makes it ideal for a couple. Panzano in Chianti is a small village that punches far above its weight, Dario Cecchini's butcher shop and restaurants there are a genuine experience, not a tourist trap, and worth building a day around. If you want a base in northern Tuscany with beautiful grounds and easy access to Florence, Villa le Calvane in Montespertoli is a picturesque property, though fair warning, it skews refined and quiet, which is either exactly right or slightly stifling depending on your energy. For Switzerland, I'd send you straight to Ascona in the Italian-speaking canton of Ticino, which gives you the best of both worlds, a Swiss village on Lake Maggiore with an unmistakably Italian soul. Art Hotel Riposo there is a hidden gem with one of the most spectacular rooftops I've ever seen, live jazz on weekends, and a warmth that most Swiss hotels can't match. It's the kind of place you check into and immediately want to extend your stay.
The ideal routing is fly into Florence, spend four or five nights in Tuscany, then make your way north through Milan and into Ticino. The drive or train through the Alps is itself part of the experience. Don't rush it, eat everything, and resist the urge to cram in too many cities. Two countries is enough.