Before departing for Kathmandu a Nepali friend put me in touch with Devraj Bajracharya. Devraj runs a company that caters to tourists, arranging lights, hotels, treks etc. The name of his company is Mountain Tawache Travels & Tours. Devraj's email address is email@example.com
I arranged that Devraj would pick us up at the airport and bring us to a hotel that he had arranged.
The airport transfer was $5 per person and well worth the money if it is your first time arriving in Kathmandu.