Hello! It's exciting to hear that you're planning a visit to the beautiful Austrian cities of Graz, Linz, and Klagenfurt. Let's dive into some travel pointers to make your trip enjoyable!

Best Time to Visit:
The best times to visit these Austrian cities are between April and October. During this time, the temperatures are pleasant and the skies are generally clear. Winter, from November to March, could also be a great time if you are interested in winter sports.

Route and Accessibility:
All three cities are well connected by rail, road, and air. Graz and Linz have airports serving domestic as well as international flights. You can travel to Klagenfurt by train from these cities or by air directly to Klagenfurt Airport.

Accommodation and Booking:
All three cities have a variety of accommodation choices ranging from luxury hotels to cheaper guesthouses. It's best to book your accommodation in advance, especially during peak season. You can use various online booking portals for this purpose.

Clothing and Essentials:
Clothing largely depends on when you travel. For the summer months, light clothing and sunscreen are essentials. However, during the winter, warm clothes, gloves, and a good pair of boots are recommended. Apart from these, always pack an umbrella or raincoat as rainfall is unpredictable year-round.

Health and Safety:
Austria is generally a safe country with a low crime rate. However, ensure that your travel and health insurance are up to date. Tap water is safe to drink in Austria. Make sure you're up to date on routine vaccines before your trip.

Local Etiquette and Respect:
Austrians are generally formal and polite in their interactions. They value punctuality and observing quiet hours very seriously. Address Austrians with their formal title followed by the last name until you're invited to use their first name.