I was part of a group of six who completed the 12 day trek to Everest Base Camp a few weeks ago. The booking and arrangements for the trek were made about 4 months prior and everything worked out as planned other than the guide from Himalayan ST&E failing to meet us at the airport.
Our guide Shiba Karki and his assistants were excellent. Several of our group were first-time trekkers and Shiba who is very knowledgeable and approachable was able to keep the group together at a good pace. When one of our members was sick Shiba carried our friend's backpack (plus his own). The assistants (porters) were also very friendly and provided excellent support.
This was my first trek and it was physically and mentally very demanding. Aside from the physical trek dealing with the cold and altitude made this a very challenging experience but one I can look back with pride.
The facilities for this trek such as the lodges are fairly basic (which is understandable) but the planning from Himalayan ST&E plus our guide Shiba enabled us to complete the trek successfully. If you are considering trekking in Nepal I would definitely recommend Himalayan ST&E.