Just to add to the great information everyone else has provided, make sure you check the sources of your reviews (and this goes for anything really). Places like Yelp are very popular sources to get reviews but what they don't tell you is that they make their money on advertising. They are like the mob of online advertising. If you don't purchase advertising through them then they put your bad reviews up top and bury your good reviews down a page or so. Then to add insult to injury they will display an add for a competitor.
For example CONDO A (who has not paid for ads) has a bunch of mixed reviews mostly negative showing first along with a nice beautiful ad for CONDO B (who has paid for ads). You click on the ad for CONDO B and see nothing but good reviews.
For the most accurate reviews you need to go to the source.