The Serengeti safari was marvelous, lots of animals, including so many lions we lost count! We were also able to go to the Ngorongoro Crater, which gave us our only view of rhinos, which was super! The Halisi camp in the Serengeti was a great camp: nicely furnished tents, good food, and good company in other travelers. After the Crater we stayed at the Kudu Lodge, which is unbelievable as its pretty much in the middle of nowhere but is a first-class luxury lodge. The only downside is we drove from the Masai Mara in Kenya and it was a very, very long day of driving on those rocky, dusty roads without much in the way of food stops. So, I would recommend a shorter drive to the Serengeti, as in a flight from Arusha.
Friendly and professionale people, they take care of you from start to end!