This is the one I use:
Bei CARWERK Wien bieten wir 13 Hebebühnen inkl. Werkzeugkasten zum Selber-schrauben an. Gleich Anmeldungsformular / Buchung nutzen. Diverses spezial Werkzeug, Öle & Zubehör sind bei uns zu finden. Sollte doch mal etwas nicht da sein, besrogen wir es gerne auf Bestellung.
www.carwerk.at
It's nowhere near as clean or well lit as it appears in the promo pictures unfortunately, but it has what you need, you can rent things like MIG welders for 10 Euros an hour etc. Some of the bigger tools you can use for free (spring compressors, big trolley jacks, oil syphon, hydraulic stands and jacks for lifting axles/anti roll bars etc into place. The bloke who's on duty when I go doesn't speak a word of English but I manage my way through interactions with rough German.
Unfortunately it's a 30 minute drive away ,and sometimes there are no places free - but it's definitely better than nothing.
I tried this one :
https://www.kfz-hobbycenter.at/ but it's insanely cramped, you have to work almost touching backs to the person on the next ramp, and it's very very busy every time I have been - queues of 5-10 people literally standing waiting for you to finish. Aggravatingly it's also a 30 minute drive away, but in the opposite direction
Again it looks very spacious in the images but it's a trick of the lens, like when you look at estate agent pictures of houses.