I've done a lot of hospitality writing and have never heard the expression. Metropolitan simply refers to a large, busy city (which Bangalore is, if that's where the cafe is). All I take away from "metropolitan cafe" is that it's a cafe in a city – you would expect it to be contemporary rather than cozy, however.
I assume UG 2 is a cafe in a hotel, and this sentence is a description of it on the hotel's website. I think they are using "metropolitan" to mean "sophisticated, up-scale, modern". It's the opposite of "home-style, family-style".