We booked the Annapurna Sanctury 7 days trek and are still very happy. The trek is rather tough within this short time, with long walking hours and a lot of ascent/descent. (descent for example 9hour 22km distance and 2600 altitude meters). Nevertheles if you are a bit in training, I found it do-able and satisfying. There is still plenty of time to take pictures and enjoy the landscape.
Langtang Ri's service was perfect (again). This was my third time with this agency and from picking us up from KTM to dropping us at KTM everything went smoothly.
We were 2 people and were acompanied by one guide and one porter. The Guide was experienced with a good english level.
I have to admit that I prefer this individual service instead of traveling with big groups with International service providers. You have the option to change the intenerary to your conditions and do not walk behind a group when you are sick/slow.
A recommendation from my side.