Color/shade of laminate to put in rental?

[Bienes Raices]

I was in the floor store looking at laminate and the store employee asked me what color the furniture was so that the laminate wouldn't clash. This hadn't occurred to me, since the house is vacant right now. Is there a "neutral" color to pick, and is it better to go darker or lighter?

Also, they had thicknesses ranging from 7mm to 12mm. Is there an optimal thickness to use?