Having visited Vienna several times, it just doesn't do it for me the way Salzburg did.
When I first visisted Salzburg I literally got the "I want to kiss the ground" feelings. I felt like I knew which street went where and really walked the right way even without much looking at maps. I don't generally get that in most places I visit. It was also the first city where I've felt the desire to buy a fridge magnet. It's one of very few cities that gave me instant "I'd love to live here" feelings.
Just like Bruce here: https://community.ricksteves.com/travel-forum/austria/vienna-i-am-an-outlier#bottom I'm one of the outliers as to Vienna. Is there anyone else? I was going to reply in that thread but couldn't post there as it's inactive.
I used to live in Bratislava and and aside from Vienna I have visited Graz, Brno, Gyor, and Maribor in that area. I found Graz prettier and cleaner than Vienna but it still felt kind of off. Out of all of them I liked Maribor the most. Brno felt kind of off-putting, which is strange because I really loved Prague.
It's strange because Salzburg almost felt like it could belong to a different country in terms of vibe. The nature is prettier than in Eastern Austria and Western Slovakia for one thing, but the whole feeling of the place is different. More lax in a way. I've since also visited Zagreb and Rijeka and so far from so many ex Habsburg areas Salzburg is still my favorite, followed by Prague and Maribor in a tied 2nd place. Bratislava, Vienna, Brno, Graz, Gyor, Zagreb, Rijeka and various small towns like Vatnice/Lednice just didn't click with me.
Have you ever felt completely different about two different cities in the same country? And anyone who specifically feels nicer in Salzburg than Vienna? Is it the nicer nature, or something else? BTW I also didn't enjoy Munich and Bavaria that much but once my train from there to Salzburg entered into Austria it was like magic. The colors of nature popped.