Response

It's hard to say precisely but since you asked for a rough quote I'd wager that this is roughly close

Modeling and unwrapping - a few hours, six maybe? Hard to say without knowing more about the project

Texturing, depends on what materials are involved, I'd assume wood, glass and a few other things like metal and plastic. My guess is 2-8 hours, mind you this is a (very) rough estimate, certain materials take longer to texture than others

A number of rendered scenes - what number would this be? I'd wager it'd take me 5-40 minutes to render one scene at 4xHD (varies from scene to scene of course, some scenes take longer than this estimate, architectural scenes usually don't)Lighting would be the easy part and shouldn't take long at all

All in all I'd wager that 10 scenes (assuming that they are all variations of the same room(s) and that each render takes exactly 30 minutes) I'd guess 24 or so hours, roughly at least.Or in terms of workdays, at 8 hours a day it'd take me 3 days to finish.
My rates for architectural scenes haven't been set, but since I have to actually survive (I can't very well do 3D work if I starve to death :P) and I have some reasonably high living costs I'd say $20-60/h as a guess (probably around $30), to be honest I don't know what the industry standard is but I'm sure we could come to some sort of an agreement, I'd really need more details to provide a more accurate quote.

My "portfolio" can be found at
CubeGod.DeviantART.com
but I wouldn't bother, I'm working on re-arranging it and it's a bloody mess and it doesn't have nearly anything up-to-date (it has a handful of test renders for a current project of mine but that's the only reasonably up-to-date thing on there).