Hello! That sounds like an amazing trip to Austria. Here are some travel tips for your visit to Vienna, Salzburg, and Innsbruck.

Best Time to Visit:
The best time to visit these cities in Austria is from April to October when the weather is pleasant. If you enjoy winter sports, December to March would be ideal as well.

Route and Accessibility:
Vienna being the capital city, is very well connected to major airports worldwide. From Vienna, you can travel to Salzburg and Innsbruck by train or private cab. Austrian Federal Railways (ÖBB) runs frequent trains between these cities.

Accommodation and Booking:
There's a wide range of accommodation options in these cities from budget hostels to luxury hotels. It's advisable to book in advance to secure your preferred location, especially during high seasons.

Clothing and Essentials:
Pack according to the season. Summers are typically warm so pack light clothing. Winters can get chilly, pack warm clothing, including jackets, gloves, and scarves. Remember to carry a good pair of walking shoes as all three cities have pedestrian-friendly locations.

Health and Safety:
Austria enjoys high standards of health and safety. However, it's advisable to have travel insurance. Verify that your vaccinations are up to date and pack a basic first-aid kit.

Local Etiquette and Respect:
Austrians generally value punctuality, politeness, and respect for privacy. In terms of tipping, rounding up the bill is common in restaurants.