I'm just back from 3 nights.
Loads of changes from when I was there last 3 years ago.
A lot more ticket inspectors on the trams and metro. I mean, it didn't affect us as we'd bought a 72 hour pass but there was one on the metro carriage who didn't get near us because of the number of fines he was issuing!
Cheapest beer was 43CzK (U Glaubicu) but most were high 50s-low 60s. No more pints for a quid.
Several restaurants, eg U Medvidku, where, upon getting the bill, the staff point to a wee bit at the bottom suggesting a gratuity of 10%.