The best way to travel is by the U-Bahn. You have to buy the monthly ticket which is 51 euros, but that'll save you a hell of a lot of money in the long run. The U-Bahn may seem confusing at first, but you'll get the hang of it in no time. You have options for a year, month, week and day pass, as well as a weekend pass (I still don’t know why this exists). The year long pass seems expensive at €365 euros but, it’s a euro a day which is actually pretty reasonable if you use the transport system all the time. here are also semester passes for students, but you have to be enrolled at a university in Vienna to qualify. All of these tickets can be either bought in the station or through the WienMobil app.

Be aware that many Austrian businesses still operate with a cash only policy, and so it is always useful to have a reasonable amount of cash with you to avoid multiple detours to cash points.