with 1500 USD you will not live like a royal family, rent prices have gone up and as a foreigner you will neve get the same price as ethiopians,
rent at least 350 dollars for small house, but nowadays, prices are more in the range of 500-700 dollars, and in Bole area at least 800, in fact 1000 dollars is almost the norm
if you only buy local food produce and cook at home, you will be able to feed yourself with 150 -200 dollars per month, but before you get to that you will have to buy pots and other kitchen utensils, if you want good quality it is not cheap.
housing is available, but you will have to search for a while, as there are many awful houses on the market, especially bathrooms are usually in very bad condition
cost of living, it is cheaper than Europe or the US, but still no cheap, and the current inflation rate is 40%, so all the prices are increasing daily.