Travel agency suggestion

I’m looking for some good travel agencies specializing in the Balkan region. My boyfriend and I are planing to visit Croatia and maybe some neighboring countries and are searching for a travel agency to help us. Do you know any good agencies?
I’ve stumbled upon Tour Croatia (https://tourcroatia.co.uk/) and they seem good. I was hoping to hear from someone with a first hand experience with them.
Cheers