I don't think I would go as tightly packed as the previous poster, unless some of the people are children.
4 people in a studio is kind of tight.
Plus 8 people in a 2 bedroom. Make sure you don't get a lockout, but a dedicated 2 bedroom. That way you get 2 queen beds in the "studio" second bedroom, otherwise you get the pullout sofa. Plus, your talking people sleeping the pullout in the LV, do depending on who is expected to sleep in the main living areas, kitchen area, someone is dealt the short straw, however kids sometimes meet that criteria.