Vienna is not a cheap capital, but transport, markets and museum concessions are all priced sensibly — the bed is the only line in the budget that really moves.
What a day costs
The fixed costs pin down easily: €9.70 for 24 hours of unlimited transport, or from €1.50 for a single digital trip (€1.60 on paper). One paid attraction is the swing factor — the Technisches Museum is €18 and free for under-19s, Haus des Meeres €23.50 booked online. Lunch from a Naschmarkt stall and an evening on foot around the Ring costs nothing more.
Hostel Ruthensteiner
Robert-Hamerlinggasse 24 in the 15th, a five-minute walk from Westbahnhof and roughly midway between the centre and Schönbrunn. Dorms, private rooms and apartments, a proper guest kitchen, bike rental, laundry and instruments in the courtyard bar. Book direct — it fills.
Wombat's City Hostel Naschmarkt
Rechte Wienzeile 35 in the 4th, with the U4 station Kettenbrückengasse at the door and the Naschmarkt directly outside. Dorms and privates; the location means you can eat cheaply without ever getting on a tram, and the 1st district is a twenty-minute walk.
Do the Wiener Linien maths before you buy a card
The 24 Hours VIENNA ticket costs €9.70 and the 7-day version starts at €25.20; both cover the core zone on U-Bahn, tram and bus. The Vienna City Card at €19 for 24 hours only wins if you will actually use several of its attraction discounts — otherwise the plain transport ticket is half the price.
Naschmarkt and the Saturday flea market
Around 130 stalls along the Wienzeile between Karlsplatz and Kettenbrückengasse, open Monday to Friday 06:00–21:00 and Saturday until 18:00, closed Sunday. The flea market runs alongside it every Saturday from 06:30 to 14:00. Buy from the produce stalls at the Kettenbrückengasse end rather than the restaurant terraces at the Karlsplatz end.