I searched my question in Switzerland forum, and found suitable answers.
The only problem that I have, is the hotel prices.
I was thinking to stay totally in Zurich.
Go to a day trip to Bern, another day to Lucerne, and maybe another day to Interlaken.
But Zurich is more expensive than others. I was thinking of 70-80 euro for each night of my stay in a single room with private bathroom, but the less prices are 100 euro.
Do u recommend any other city to choose to stay? If I stay in Zurich, I must find a hotel near the train station or its okay to be far from the center and train station?
Many thx in advance