New to Nairobi and looking for low rent options (& fun things to do!)

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One question - have you arranged a work permit, or Special Pass for your trip?  I'd recommend it, as doing voluntary work (or work of any sort) is prohibited with the 'standard' Single Entry Visa'.  From your brief description what you are planning to do would constitute 'work' and of course being online isn't particularly low profile (unless you publish all your content after you have left).

Voluntary work has to a large extent dried up.  Part of this is due to enforcement of the immigration laws and part is to do with Kenyans dislike of westerners tendency to portray Kenya and indeed many other African countries in a somewhat negative light, highlighting the struggles and poverty and 'bad news stories'.

Nairobi is not a particularly cheap city.  Accommodation wise, the cheapest is in areas which are more dodgy.  There is this site, which may help:

https://www.homestay.com/kenya/nairobi

I'd avoid property realtors unless they can offer very short term lets - property rental terms are similar to the UK.