Where can I find a decent place to do remote work in Addis Ababa?

I will be living in Addis Ababa from the end of February until the end of August. I normally work as a software developer in Sweden and I hope to continue doing that in Ethiopia (albeit remotely).

That means that I am looking for a decent place to work. A place where I can work like that preferrably includes the following, in descending order of priority:

Reliable outlets

Reliable and fast internet connection (I know this can be a bit shaky at times)

Being able to work there for 8h a day

Comfortable chairs

An extra display (as I'm only bringing my laptop)

Near the Old Airport area

An internet café might be an option, if they're okay with me working there every day of the week. If there's a place where you can rent office space (something like http://www.instantoffices.com/en/se/office-space/stockholm) that would be very interesting.