We are seniors and are going to spend 3 days in Vienna. Our hotel is just off Mariahelferstrasse. Do we need a tram/bus pass? We hope to cram in as many sights as possible.
Sandy , if you go to ... http://www.wien.info/en/travel-info/to-and-around/public-transport , you will find a complete listing of all you need and prices for Vienna mass transit .