Thank you guys for advice.
After reviewing all answers and tuning materials and settings, I came up
with that:

http://img170.imageshack.us/img170/797/bedroom01hli4.jpg

Radiosity settings:

radiosity {
pretrace_start 1
pretrace_end 0.003125
adaptive 2
error_bound { 0.1 adaptive 1.5, 20 }
count 500
recursion_limit 3
brightness 1.5
low_error_factor 0.2
nearest_count 7
}

I use sphere around my scene with such material:

*env
pigment
{
color rgb <0.842, 0.937, 1.000>
}
finish {
ambient 2
}

And also I use parallel light.

I still can't figure out how to get a rid of artifacts (maybe to increase
count to >1000), how to have windows not being overbrightened and have room
lit more evenly and make it lighter (that are a main concerns).
Any ideas?

Alain,
If I use this formula for "pretrace_start": >Default = 0.08 or 8% of the
image's width<, I get pretrace_start = 640*0.08=51.2 and it cause a huge
increase of rendering time and I get a l ot of artifacts :( Why? What am I
doing wrong?
Also you said: "Keep it at the (pretrace_start / 2^n) domain." What is
"2^n"? I mean "n" - where is it coming from?

Thank you guys, I appreciate you time!

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