Planning with (Plural N- Word)

"So we'll need about 6 hotel rooms to fit all of us." 

.....

"I'm looking for a house that will sleep 16 people." 

......... (13 bedroom house) 

"Well, now we have 21 people, is there enough space?" 

........ (someone else rents the house before we get our deposit in) 

"Well we need about 4 hotel rooms now."

..... 

"We just need two cheap hotel rooms for the weekend." 

...... 

"One room is fine; it'll just be 5 of us."