Near or Far?
Most venues have limited accommodation on site. If you want your team to stay at the property adjacent to the venue you need to book early. Check for organiser arranged discounts or price-plans. The further away from the venue the longer the travel time and possibly the greater chance of delayed staff arrival for opening times. If the venue is popular with other exhibitors and visitors that may in turn increase available networking opportunities.
Sharing or Solo?
In terms of stretching your budget, it might be better to ask staff to share rooms, or commute if possible and use the savings to increase your hospitality budget. If money spent in one area is delivering results it doesn’t make sense to reduce it because of extra costs involved with exhibiting. Save money where you need to but not at the expense of generative activities.