Unfortunately, Jenners itself does play piped music, quite loudly at times. If you can negotiate that, peace and quiet await you in their café areas. Both are self-service, one on the second floor and one on the fifth floor (Café Zest). Both serve coffee, snacks and light lunches. There is a different menu in each café. The view from the second floor café, looking out over Princes Street Gardens and the skyline of the Old Town, is particularly recommended