Hello! It's fantastic that you're planning a trip to Vienna, Salzburg, and Innsbruck. These Austrian cities have much to offer, from majestic palaces and landscapes to cultural charm.

Best Time to Visit:
The best time to visit these cities in Austria is between April and September when the weather is most comfortable. Also, December can be a magical time to visit due to the traditional Christmas markets.

Route and Accessibility:
You can start your trip at Vienna, which is well connected with the rest of the world via Vienna International Airport. From Vienna, you can take a train to Salzburg, which takes about 2.5 hours. From Salzburg to Innsbruck, the train journey is about 2 hours.

Accommodation and Booking:
From budget hostels to luxury hotels, you'll find a range of accommodations in all these three cities. It's advisable to book in advance, especially during peak tourist season. Some popular online platforms for booking include Booking.com, Airbnb, and the official Austria tourism website.

Clothing and Essentials:
During the summer, lightweight clothing is usually adequate. However, always carry a raincoat or umbrella as showers can be frequent. In winters, warm clothing like coats, gloves, and scarves are essential. Comfortable walking shoes are a must any time of the year. Don't forget your sunscreen and sunglasses.

Health and Safety:
Austria is a very safe country, but like anywhere else, remain aware of your surroundings and keep track of personal belongings. It's advisable to have travel insurance. Keep emergency numbers handy.

Local Etiquette and Respect:
Austrians are generally formal and polite. Shaking hands is a common form of greeting and it's customary to say 'Guten Morgen/Tag/Abend' (good morning/day/evening). It's respectful to understand their tipping culture where a 5-10% tip is customary.