If you are alone or are meeting a friend for a short chat in the evening and you have no intention of getting drunk, try the coffee shops near the tram stations in the first district like Cafe Schwarzenberg, Cafe Am Schottenring (Boerse), Cafe Landtmann (left of Burgtheater) and you'll be pleased with the ambiance. These are easy to find meeting points and they are quite famous among Viennesse.
Dress Code: The waiters are neatly dressed so I hope that's a hint. Many politicians and stage artists frequent Cafe Landtmann. In here, I suggest you think twice if you're wearing a worn t-shirt and a new pants with holes in them because it's just not the right place for you.
Cafe Schwarzenberg is also very nice. I like it a lot.
Cafe Am Schottenring used to have a pianist. I don't know about it now.
Nice coffee, nice drinks, nice salads, nice cakes, nice place... You'll like your visit.
Cafe Cortez is a trendy cafe during the day, but by night time, it turns into a cosy cocktail bar. It has faux-leather couches for guests to sit back and relax, while enjoying their drinks and listening to good cool music. The kitchen will serve light food/snacks in the evenings. Cafe Cortez usually closes late in the evening, and on Fridays and Saturdays, it will close as late as 2.00 am.
On weekdays, Cafe Cortez has happy hour starting from 8pm until closing and serves cocktail drinks at half-price. They also have a limited selection of wines and beers.
Dress Code: Casual - jeans, T-shirts and sneakers are OK.
Café Ritter is one of the oldest traditional cafe and it is a good place to linger with a melange or a brauner after a tiring day of shopping up and down Mariahilfer straße. The cafe staff can be gruff and grumpy, but it adds to a certain charm of being in a Viennese cafe.
There are several branches of Cafe Illy in Vienna. I visited the one on Favoritenstrasse, to the south of the city centre.
Cafe Illy is a standard chain cafe with a laid back atmosphere and a varied clientele including families, teens and adults. The interior is modern with red chairs, black tables and a few TV screens showing music videos.
The extensive drinks menu includes all manner of coffees, teas and other hot beverages as well as milkshakes, beers, wines, spirits and soft drinks.
A continental breakfast can be purchased up until 2pm each day, and the rest of the food menu is typical cafe fare (a large selection of cakes and pastries, ice cream sundaes and toasted sandwiches).
I had a piece of Sachertorte (a very sweet chocolate cake with a layer of cherry sauce and served with whipped cream) - cost 2.40 Euros; and
A Heisse Schokolade mit Rum (Hot Chocolate with Rum) - cost 3.80 Euros.
A good place to stop for a quick coffee and a cake!
Dress Code: None