Our trek to the base camp of everest was organized by Third Rock Adventure and we are satisfied and happy beyond our expectation. They have good chain of hotel in Thamel and have good contact in Everest area. My friends also did ABC and Poon Hill trek with them. We love how they serve us and recommend according to our interest. We recommend them to youl; all you have to do is text Naba on FB or Whatsapp and he will arrange every thig for you with detail information for the trek. You will love it. Just do it.