What a super project this. It's braver than anything I'd ever attempt, I try to sweep my own street as much as possible but this is so far out of my comfort zone (starting with the climate) that I have nothing but sheer admiration for you.
The brave bit to me is to leave your comfort zone in such a decisive way. Feel free to disagree, I'll call you modest and brave ;)
How do you do it? What scares the hell out of me is the future. What happens if things go sour? How do I know I can actually be a good programmer or entrepreneur? How do I save up for my pension (I am 27, that might seem premature I know) if things go bad?
As for the climate, I can say that in Rwanda it is amazing. Pretty much beautiful weather every single day. It's near the equator, but at elevation. So it hovers around 80 degrees most days with a gentle breeze. It can get hot in the middle of the day, but not uncomfortably so. Rainy season brings torrential downpours for an hour or so twice a day -- which is always welcomed.
To be honest, Kigali is one of the easiest places to do this in Africa (if not the easiest) when looking at all factors, so we are bit spoiled in that regard. I was surprised, when talking this over with my wife she was on board right from the beginning and even moved here sight-unseen. So, I'm grateful for that. Having kids also adds the extra hurdles of finding schools and such, but nothing too difficult.