My partner and I spent two weeks in Nepal in April 2017. Usually we like to go with the flow, and make decisions about what to see/do as we travel. In this case we only had two weeks, so we decided to work with a tour company to organised things.
After contacting 3 or 4 companies, we decided to go with Angie and Siddartha at Eyes on Nepal. The organised everything perfectly. They were also very responsive to changes that we wanted to make. All of the guides were very professional, knowledgeable, and friendly.
We spent a few days in Kathmandu, traveled to Pokhara to complete the Poon Hill Trek, and then went on to Chitwan for a few days.
Can definitely recommend Eyes on Nepal. They will take very good care of you