Honeymoon in September 2023

Hello Redditors, I would really appreciate your tips and critique on my travel itinerary.

Arrive in Munich , explore the city.

Take a train to Innsbruck. Spend 3 days there, I’ve seen some amazing scenery there and beautiful hiking areas.

Take a train to Salzburg, staying there for another 3 days.

Then my final stop would be at Vienna, which I will take a train from Salzburg to reach and then fly back home.

I am having hard time arranging this time as I rarely travel, I would really appreciate your tips and welcoming any suggestions.

Thanks.