Hello there! It's brilliant to hear that you're planning a trip to Austria! The cities you've chosen are all beautiful, with a rich heritage and awe-inspiring scenery.

Best Time to Visit:
The best time to visit Austria depends on what you're looking to do. If you're interested in sightseeing and experiencing the city life, then April to October would be ideal. However, if you're interested in winter sports or wish to see Austria's beautiful snowy landscapes, then December to March would be perfect.

Route and Accessibility:
The recommended route would be to start in Vienna, then head west to reach Salzburg, Tyrol, and finally Vorarlberg. Austria has a fantastic train network that links all these places. You can get the OBB (Austrian Federal Railways) ticket for unlimited travel within Austria.

Accommodation and Booking:
Austria has a wide range of accommodation options ranging from luxury to budget. It's advisable to book in advance, particularly in peak season. Booking websites such as Booking.com, Airbnb, and Agoda can offer various options. However, consider staying in family-run Gasthofs for an authentic Austrian experience.

Clothing and Essentials:
For summer trips pack light clothes, but always include a jacket or sweater as it can get cool in the evenings. For winter trips, pack warm clothes, thermal underlayers, good quality gloves, hats, and waterproof boots for the snow. Don't forget your sunglasses and sunscreen, as the sun can be quite strong in the mountains.

Health and Safety:
Austria is generally safe, but basic precautions are always recommended. If you're taking part in winter sports, consider insurance that covers these activities. Also, remember to stay hydrated and protect yourself from the sun at higher altitudes as UV rays will be stronger.

Local Etiquette and Respect:
Austrians appreciate punctuality and politeness. German is the spoken language, though English is widely understood in urban and tourist areas. Respect the environment, especially when visiting mountainous and rural areas, by not littering and observing local regulations.