As with any subfloor/substrate you'll want to make sure its VERY flat/smooth, imperfections will telegraph upward because the LVP material is thin and flexible.

Maybe use some imperfect comps and make adjustments. 

Also, while a light grey is a safe bet and helps hide any imperfections when laid, going with a charcoal or black can also make things feel a touch more modern.

Are those too little of imperfections I should just ignore them or shall I ask the contractor to fix them?

With the curtains drawn back, I could see a lot more imperfections.

@Fan Bi it's all just speculation and I agree, you can't sit out of the market entirely, but I will say I was a lot less cautious in 2013 than I am today.Unfortunately, as human beings we are inherently imperfect prediction machines - whether it's real estate prices / cap rates, Federal reserve interest rate moves, the stock market, inflation/deflation, tax/economic legislation, etc.For any one of those factors in isolation, we might be able to make an educated guess and be mostly right, but combining them into one big soup and your guess is literally as good as mine or the next person's.And then to further complicate things, the right answer for you and your situation might not be the right answer for me and my situation, or someone else and their situation.It really does end up being as much of an art as a science, and makes me think most predictions I read online - including my own - are probably not worth the paper they're printed on (pun intended).

We have tried it all from the base up and what we like about this level of laminate is that it lays way easier, goes over minor imperfections without coming loose (there is more room on the laminate for it to lock into the other pieces) and does not need a separate layer of padding underneath it. 

If the doors are in decent shape, you can probably get away with just sanding any paint imperfections smooth, rather than stripping (I did stripping in my first house, but that's because there was more natural woodwork than painted and I wanted to get rid of all the paint on wood).

But the seams started to fail (and curl) and floor imperfections were broadcast through the product much more than in the 3.8mm version.

Do not let the lack of knowledge/ experience prevent you from taking imperfect action.