@Kit536 If multiple recent reviews make similar negative claims, they're very likely to be true. But if you definitely don't want to cancel your booking, I don't really see much to gain by contacting the host about it.
I guess the advantage to being forewarned about the problems is that you can lower your expectations accordingly. Hopefully you'll be enjoying your vacation enough that it doesn't get to you. But you might want to have a Plan B for what you'll do if conditions are truly unacceptable and you just can't bear to stay. Airbnb would probably grant you a refund, but you'd have to bear the extra cost and hassle of finding a last-minute alternative.