I wish I'd had the space for a full size bed. It would be so nice to be able to lie down with my children on occasion (eg. nurse to sleep when they were babies or maybe just lie down while singing lullabies instead of sitting up). We also use the twin for guests; a full would be better (though not as good as a queen). We've made due with a twin for DD's room; DS has a toddler bed. If you have the space for a full size bed, I'd go for it. There is cute kiddie bedding for both sizes.