Shiva dhakal, which is himself a guide is the owner of this young agency.
I hardly recommend you to contact him while planing a trip in Nepal, he will for sure help to plan holidays (always with the smile !) which will perfectly fit you.
Either him or a guide he is working with will bring you everywhere around Nepal, either for cultural visits, on trekking tour.
Since it's a young and small agency, you'll be more than clients for him and I'll go back to my place with a new nepali friend.
A last point to convince you : Shiva is also working in an orphanage (which opened after 2015 earthquake), and the benefits from himkala adventure mainly goes to this orphanage.