I highly recommend Good Vibe for anyone considering trekking in Nepal.
Kishan, the owner, is very friendly and did a great and honest job throughout the whole booking process. As he said, even though our guide, Samdo, didn't speak as much English as the other young guides, he more than compensated with his caring and responsible attitude and with his knowledge about the mountains, the villages and all the different trails along the way. Also even with my complete lack of understanding of the Nepali language, more than once it seemed clear that the other young guides would come to Samdo (I'm probably misspelling his name - sorry!) for advice.
Other than that, I doubt that you can find a better price than what Good Vibe offers. Extremely competitive while maintaining an excellent quit service.
All in all, I couldn't be happier with the service provided and I would recommend this company to anyone.