when the lights are on its safe to have it at 80 degree, when its off its ok that the temp drops 10 degree.
doesn't matter what size room you have for veg humidity should be about 55%-65%, for flower should be 40%-50%. Both give or take a few percentage off. At the end of flower its better to have the lowest humidity as possible as that will induce more resin and also keep buds from molding.