We stood for a week (Jan 2014) in the Jungle Junction and really liked it. The place moved and is now very safe, the security has been heavily upgrade: 2,5 m walls with barbed wire, 3 watchman at night on duty, 200m to the police station, watch dogs emergency buttons and a armed security company. That's what I call pretty safe.
Apart from that the athmosphere is really nice, Chris the owner tries to make everybody feel at home, camping and the food is good and inexpensive ( at least for Nairobi standards, dinner Kshs 550, camping 700). If needed, you can be driven to the airport or into town, 200m away there is a market to buy the basics. Chris operates a workshop for motorcycles and cars, he even had some new tires for us though those ones for the big motorcycles (Honda NX650 and XRV 750) are not common in Africa. He is a trained BMW mechanic and has an excellent knowledge of the common cars (Landcruiser/Rover) as well.
We made some bonfires and BBQs on our own, and had a really good time waiting for our Sudan Visa. Met a lot of other Transafrica travellers and exchanged a lot of advice.