Currency — the euro
Austria is on the euro, which makes it simpler than Switzerland or Czechia, neither of which is. The one thing to refuse: if a card terminal asks whether you want to be charged in Canadian dollars, say no and choose euro. That is dynamic currency conversion, the rate is set by the merchant's payment provider rather than by Visa or Mastercard, and your own bank's foreign-transaction fee can still apply on top of it.
Cards and cash — Austria is more cash-minded than you expect
This is the practical difference that trips up Canadians. Debit is widely accepted and credit cards work in hotels, department stores and larger restaurants, but a great many Beisl, Würstelstände, market stalls, bakeries, small cafés and public toilets take cash only, sometimes with a minimum for cards. Global Affairs Canada also flags credit card and ATM fraud for Austria, so draw cash from machines inside banks. Carry notes; do not assume tap-to-pay.
Tipping
Round up, roughly five to ten per cent in a restaurant. The mechanism matters more than the amount: when the server tells you the total, you state the figure you want to pay including the tip as you hand over the money — you do not leave coins on the table afterwards, and you do not compute it later. Card terminals here have started prompting for tips, but tipping in cash even when paying by card remains the normal Austrian habit.
Power — Type C and Type F, 230 volts
Austria uses the standard continental European sockets: Type F, the round two-pin Schuko, which also accepts the slimmer Type C europlug. Voltage is 230 volts at 50 Hz. A Canadian flat two- or three-pin plug will not fit, so bring a europlug adapter — the ordinary cheap kind, unlike Switzerland. Anything marked 100–240V (phones, laptops, cameras, most chargers) works on the adapter alone; a 120V-only appliance such as a North American hair dryer does not, and will burn out.
Tap water — among the best of any capital
Vienna's water is piped by gravity from Alpine spring zones on the Schneeberg, Rax, Schneealpe and Hochschwab through two mountain spring pipelines, the Hochquellenleitungen, built in the 1870s and the 1910s. No pumping and no significant treatment — it arrives under its own weight. Drink it without a second thought, refill at the street fountains labelled Trinkwasser, and note that a glass of it arrives free alongside your coffee as a matter of course.
Language, and the scam that actually gets people
German; English is widely spoken in the centre and at attractions, less so in the outer districts. Global Affairs Canada rates Austria 'take normal security precautions', flagging pickpocketing around Stephansplatz, the Hauptbahnhof and Westbahnhof and on crowded trams and U-Bahn, usually with a distraction — a spilled drink, unsolicited help, a long conversation. The specific Vienna trap is the costumed 'Mozart' concert-ticket sellers around Stephansplatz and the Staatsoper: street selling here is regulated rather than banned, so this is not in itself illegal, but the grand-sounding concert frequently turns out to be a small ensemble in a rented room rather than the hall the flyer implies. Buy classical tickets from the Staatsoper, Musikverein or Konzerthaus box offices directly. If you are hiking the Vienna Woods or the Wachau between spring and autumn, Austria also has tick-borne encephalitis in forested areas — cover up and check afterwards.