There are a few people in Nairobi who live alone in 2 & 3 bedroom flats and are willing to house-share or give accommodation to travellers/ tourists/visitors for periods of time. One is on Ngong Road and another in Langata near Carnivore Restaurant. Then there is one in Nairobi West and also Jamhuri Estate all of who live alone and are willing to share/accommodate -a bedroom for yourself and share the rest of the house with host.
It costs you about Kshs1000 ($15 or £7) a day. Would probably work out to less than USD500 a month. You also have your laundry done once a week. And House help available.
E-mail me & I’ll give you more info and contact.