Maybe in no other part of the world you will find as many uncompleted buildings as in Nigeria. I don't exaggerate when saying that almost one house in ten is uncompleted and does not seem to get completed in the near future. In some rooms you may be find some banana trees growing in them.
The traditional house is built of mud. It is cool inside even at high temperatures outside. Nowadays most buildings are brick houses or of concrete. Only in the villages you can find some traditional mud houses but there are not many of them any longer.
A European may be shocked by the mass of scruffy huts around the roads. I am not sure whether they are just used as sun protection for traders or used as flat for poor people. Anyway, after some days you will get used to that sight.
Rich people have a wall around their houses. These walls have spikes or barbed wire on the top - like barracks. For entering such a compound you go through a big gate. Anyone who can afford has a gate guard who opens the gate. These walls and spikes are for protection against thieves and strangers.
When entering a flat you stand in the living room directly. There you find a big couch, arm chairs and a TV-station. Next to this room are the dinning room and the kitchen. This kind of apartment reminds me of the common US-American television apartments.