> Either adjust all ratings to an agreed average (e.g. 3 stars) or let users "use up" their 5-star ratings allowance. This doesn't take into account people who

> Either adjust all ratings to an agreed average (e.g. 3 stars) or let users "use up" their 5-star ratings allowance. This doesn't take into account people who are really picky about choosing accommodations and so only stay in listings that are worth of five stars, vs people who are very budget conscious and only stay in listings that are worth 3 stars. If you normalize these two people's ratings that will give the same 3-star average rating to both marginal and great listings.