Uh that's tough to say - I mean, there's souvenirs, but in terms of more practical value there's not much I'd go specifically to Vienna to find.
That said, it's one of the cultural centres of the world. Amazing arhitecture, and of course various cultural events and classical music... Also, maybe nothing that you could *only* get in Vienna, but there's every shop you could think of there. From Redwing shoes to Kiton botiques...
What always amazed me most in Vienna is the public transport. It's ~12€ for a weekend pass, and you can hop on the busses, the tram, the ubahn subway... 5 minutes and you're on the other side of the city. There's always some form of public transport near you. And it's all so very clean and organized.
Bad thing is that restrooms are all paid. A bit of a cliche in Europe. The bathrooms are always paid in more touristy areas.
By the way, many Gedore tools are made in their Austrian factory. In general, if something is Austrian made, it's usually really well made. Just prejudice/expectation, but I'd put Austrian products in quality somewhere under Swiss made but above German made... And Italian products are a wild card, it can be very good or chinese-grade. For example, Mercedes makes most of their SUVs in Germany, but the G-wagen is in fact made by Puch in Austria (and over here they are not branded as Mercedes, but as Puch). I think Puch is located in Graz. In fact Graz used to also be a very Slovene town (Gradec), and Puch was founded by a Slovene inventor Janez Puh (Johannes Puch). So, our history is very mixed, but the borders fell as they did after WW2... Puch may also be known in the USA by the moped Puch Maxi they made in the 70's. And before that some very very quirky motorcycles like the Sears Allstate 250 "Twingle". It's a split-single two stroke engine, single "cylinder" with two pistons, really interesting concept that worked rather well for its time. Of course it was only branded Sears in the US, here's it's the Puch 250 TF or SG or SGS...
Maybe check the Bauhaus for some stuff. PB Swiss is also typically way more expensive in the USA but I'm not sure if he'll find it in the Bauhaus. Certainly they'll have some Wera and Knipex.
Thanks, that is always nice to hear

Actually recently also got a girlfriend who's an expat from South Africa (their country has lots of problems, not a good place to be a white resident at the moment so a lot of them are leaving). She's practically native in English, so I use it a lot (in fact her native language is Afrikaans, which is a weird Dutch dialect, but she always also used English cause there's so many languages used in South Africa).
Yes I think over half the country is forest which is a lot for Europe (and also I think the last central European country with relatively large populations of wild bears and wolves).
Unior is good for sure. Their main buisness today is actually forging crankshafts and conrods for all kinds of European cars (from Italian sportscars to Audis...). Yes the metal industry is really strong here, lots of stuff is made for the German car industry, for all of them but I think especially a lot for BMW.
But today Unior makes great regular wrenches and sockets. And decent cabinets. I'd stay away from most other stuff, I am never sure because some of it isn't as good as it once was and I know they rebrand some Taiwan tools too (in general the stuff with laser etched markings is best avoided, but if it is stamped/forged branding then it's typically good quality). The ratchets are really crude - they work, but I've been spoiled after I tried some snap on and nepros stuff...