Planning a trip to Madagascar

Hello everyone, I am part of Internations Hamburg (Germany) but I am planning some holidays at the end of August for around 3 weeks in Madagascar (after watching some amazing videos).
I plan to be 2 weeks doing the typical tours in Madagascar and 1 week in the beach (Ile Sainte Maire) - I want to do some whale watching there too... I hope it is possible to see orcas as well!
Any recommendations for doing this? Tour operators? Places to stay? Level of safety/security? etc...
I would really appreciate it (:
Thanks a lot in advance,
Jose