Lushoto is a city in Tanga.
To get to Lushoto from Dar, you can take any bus to Moshi/Arusha and get off at Mombo (4.5 hrs). Then take a dala or coaster up to Lushoto (1 hour, 2500sh.) Or there are a few buses that go straight to Lushoto from Dar. Ibariki Tanzania bus is 12,000. Mbaruku is 10,000. There are a few others, but those are the two main ones. To get to or from Moshi/Arusha, you can take any bus to Dar and get off at Mombo or take Fasaha or Chakito straight to Lushoto. It’s TSh13,500/= from Moshi, TSh14,500/= from Arusha.
The hike up to Irente View Point can be done with or without guides. Guides can be found at the tourist center behind the bank. The hike is about an hour and a half to 2 hours to the point. There is a picnic lunch available at Irente Farm that is well worth the hike. Lunch includes fresh rye bread, seasonal fruits and vegetables, cheese slices and a herb and goat cheese spread, butter, jam, and juice, all made there at the farm. Lunch costs TSh6,000/= and does not need to be ordered in advance.
With their wide vistas, cool climate, winding paths and picturesque villages, the Usambaras are one of Tanzania’s highlights. The mountains are home to an exceptional assortment of plants and birds and representing one of the highest degrees of biodiversity on the continent. Lushoto is an excellent starting point to explore the Usambara Mountains. You can make a three day hike to Mtae or MamboViewPoint 
Excellent Fried Chicken (TSh2,500/= with rice, beans and spinich) or Fried Fish (TSh3,000/=) at the little hoteli next to the internet place across the street from the bank.
New Friends, behind the bank for a reasonably priced local bar. Lawns Hotel, on the road into lushoto for a fully stoked pub atmosphere. They also have satellite television for sporting events