I think it changes if you use a simple diffuse color on the material settings or a map (because of different gamma correction (?), maybe someone can confirm) but I find that values aroud 190 / 210 work well for white walls.
Right now I'm doing some lighting tests for an exterior, with strong direct sunlight from a cgsource hdri, and with a white value of 200, my compression is at 2, and it starts to look quite ok. So I guess that for a diffuse lit interior like yours, compression wouldn't even be necessary, and that's probably why you get the flat look.
There's another interesting discussion regarding albedos on the forum, around the whole pbr thing, check that out as well.