This is Vienna's version of a department store, and it's huge. I've only purchased a pair of boots…read morehere (on the first floor/American second floor), and the people working in that department were quite helpful and friendly, although they didn't speak a lot of English.
My fiancé looked for a dress shirt here (men's department, I forget which floor), and the lady was a bitch ("kind of" redacted). The whole floor was pretty much devoid of other people, but it took forever to get some help, then she let him try on only ONE shirt. She insisted that the others (in the same size) would all fit the exact same way; I believe the idea of sizes running differently for different brands, and wanting to see how colors/patterns look, was lost on her. Either way, we left immediately - the shirts were all overpriced anyway.
Pretty much everything in this store is stupidly expensive, although their women's shoe department seems to be a bit of an exception (maybe I have a bias?). That department have a lot of sales, though, and since the ladies working there were nice, I have been back to that one department.
I've given this place 3 stars instead of 2 because:
--In the basement of Gerngross is Merkur, a higher-end grocery store in Vienna. It's owned by the same company that owns Billa (another Viennese grocery store), but it's more expensive than Billa. Merkur IS much bigger, and tends to carry items that Billa doesn't, so we'll go to Merkur when we can't find something at Billa.
--On the fourth floor (American 5th) is an electronics store, Saturn. This is kind of the go-to electronics store, and the people there are generally pretty nice and helpful. We've bought a space heater, Nespresso machine (don't judge), humidifier, soda/CO2 machine,* oscillating fan, and various little items like CAT5 cables, etc, there. I like Saturn. They also sell prepaid and region-free cell phones, CDs and vinyl, computers and iPads, etc.
Note!!! Saturn takes only cash and Bank-O-Mat/EC cards (Austrian/German debit cards) - they will NOT accept American debit/credit cards, so bring cash!!!
We go to Gerngross for Merkur and Saturn more than anything else - the rest of the store (the department store/ "Macy's" part of it) is wayyy too expensive to bother with.
*I'm obsessed with soda water. Don't judge.