No river views from Hilton Old Town.
This site is good for checking out concerts etc ( and for buying tickets ) :
https://www.pragueexperience.com/ope...&EventMonth=06
I went to the Bolero concert in the synagoge once and enjoyed it.
If you are in Prague on a Sunday, Hilton Prague Old Town offers a really nice Sunday Brunch (called brunch but it is actually a lunch-dinner thing, from 12 to 15, I think).