Terrific Vacation with Hello Tanzania ! :)
I visited Dar es Salaam, Tanzania, for work last summer (June 2013) and was looking to do some tourism over the weekends. As a young woman travelling alone, safety and reasonable prices were my two main concerns. I ended up contacting "Hello Tanzania" and did not regret it at all!
The trips were a two-day safari to Ngorongoro Crater and Lake Manyara and a a one-day tour to Zanzibar (StoneTown, Nungwi Beach, Spice Tour). The two trips went incredibly well. Even though I contacted them on a very short notice (a couple of days before), they still managed to organize everything in only a few days and I was able to do even more than what I was expecting.
The travel agent/owner was particularly kind (had a great sense of humor) and was extremely professional! Their driver, and the tour guides were also very kind and helpful.
All that to say that I strongly recommend "Hello Tanzania" and that I would do another trip with them in a heartbeat.