Settling In Services: Who's the best in Berlin?

Some of you surely received settling-in services (sometimes called destination services) paid for by your company when you relocated to Berlin. Can you please share if you were pleased or not with your services and by whom they were conducted? I run a small expatriate consulting business out of the U.S. and have some new clients who will be relocating employees to Berlin. I need to connect them with an agency for both destination services and German language training. Thank you for letting me know who is the best. (Please no solicitation replies.)