EV5 – EV15 – IT – CH – DE   May-June

This is my itinerary so far:

1st week (🇮🇹): Rome, Viterbo, Acquapen, Siena, San Miniato, Lucca, La Spezia, REST day.
2nd week (🇨🇭): Milan, Como, Bellizona, Airolo, Andermatt, Altdorf??, Arau??, Basel?
3rd week (🇩🇪): Strasburg, Karlsruhe … follow Rhine 3-4 days.

1.  🇨🇭 Any suggestions in crossing the Alps? Good hostels to stay? You know anyone who could host me?
2.  If I can only do either Fidenze -> Milan, or Milan -> Como. Which one to do? Where would you spend an extra day?
3. What is a good budget for 🇨🇭? I was hoping to find hostels for e50 but all I can find is >e100.
4. Any sugestions to find hosts in warmshowers and couchsurfing? I've been writing, but no answer. Is it easier to find hosts if I bring my mattress and sleeping bag? (I dont want to bring a tent)
5. Steepness of route . I have done cycling +1,200-1,500m ascent. But the slope matters. Different 4% – 8% – 12%!! Are there very steep parts?

*I'm a Guatemalan used to warm weather… how cold will the Alps get in early June? What about the rest of the Rhine?