Just to share .. I have done 100 single units and have had them for like 2yrs now.
returns are good when you have full occupancy, challenges and expenses;
exhauster services, caretaker salary, 10% comm on the agents, repairs etc
What to lookout for; elec bills - install individual prepaid metres for each, let tenants pay for the elec consumption. It is hard convincing tenants to jipanga na elec bills collectively is difficult.
rent was sh.2700 now is sh.3000 p.m.
again, location location location
happy hunting