ignore these self-hating maryooleey. eastleigh (islii) is actually one of the most beautiful areas of nairobi. yes, it is mostly somali. and, no, it is not 'slum'-- it actually is one of the most expensive areas of nairobi.
south c and south b are also now mostly somali. they are cheaper than eastleigh but they are quieter. everyone is in their home. in eastleigh, you see many people on the streets; somalis, ethiopians, indians, arabs, etc.
if you go, visit the mesuems.
very cool stuff, wallahi. you want to visit the ngara neighborhood, which is filled with the kutchi world (south asian.) a good friend of mine lives in hurlingham... and i always stay with her... because i can honestly say it is the most peaceful neighborhood in the city. you can just sleep for hours... to your heart's jet-legged content
also... you want to drive on the a109 highway. it goes through the athi river, sultan hamud, makindo, tsavo, etc... which are all some of the most beautiful areas of kenya.