Carry some cash. It is not unusual for some cafes/stores to accept cash only. While credit cards are widely accepted, it is not always the case. Please be aware that most stores (including most supermarkets) are closed on Sunday. Some general information about opening hours is provided here: - https://www.wien.info/en/travel-info/tourist-info/opening-times-354624 FFP2 masks must be worn in essential stores (drug stores, supermarkets) and in some other stores.
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