Online reviews are tricky. The extremely negative views may or may not be based on fact so much as personal bias. Overall, there is always going to be that one or two reviews that says “this is the worst experience I’ve ever had!” It could be that the negative reviewers are negative people in the first place. Those might also be anonymous reviews from competing establishments. Or it could be because the place is genuinely that bad. If there’s more than 3 reviews that say “this place is the worst”, be very wary. At the same time, be wary of the places that have only one or two reviews that say “this is the best place I’ve ever been” because many times, these are written in-house. Average out the reviews. Don’t be afraid to actually call the place even if it does cost you a few dollars/euros/etc for phone charges. Sometimes, talking with an employee can make a big impression one way or the other.