What colour side tables?

I see the nailhead sofas and imagine pulling that metal tone out to the side tables.  Whatever they are, a light bronze or copper...I would consider that direction.  Lighter than the seating, but not so drastic like white would be.

You desperately need a complementary color with so much brown.  Adding some yellow or teal (or both) with pillows, accessories, or wall art would go a long way.

same as your floor , stained wooden would look good .

Off white or the color of your trim.

Don't match the walls. Otherwise they will just fade into the background.

It’s all dark there, how about just some bright color? For punch

Chrome - the sharp edges of the table will make it look industrial and fit in with the leather.

I would not match the kitchen with the grey. Too matchy matchy. I think white would be too casual with this dark sofas.  

I would paint it a metal tone. 

why not grey to match the kitchen. shows continuity. 

As you stated.... probably an off white.