An icon of the Konditorei scene, Aida is a time warp for coffee lovers. Its pink-and-brown colour scheme – right down to the waiters’ socks – matches the 1950s retro decor perfectly and most of the clientele are well into retirement. Order a Melange and a slice of cake (there are almost 30 to choose from) and head upstairs to spy on the activity on Kärntner Strasse. Twenty-nine such Aida gems are scattered throughout Vienna.