Used it a bunch of times all over the world, but have only had one poor experience where the owner was a bit expansive about the condition of the flat. For example, describing having a condenser in a room as “air conditioned flat” and charging us a cleaning fee when he’d not cleaned it in anticipation of our arrival.
Watch out for seasonal pricing when booking, because the price you see may vary and it is not reflected in the price on the image when you see the listing.
Complain immediately within the first 24 hours if there’s anything not to your liking. The prices these days (especially in cities) is equal to or more than a decent hotel, but looking on some hosting forums there is a bit of an entitlement mentality amongst some of them.
I’d definitely use the service again, but I’d not discount hotels and I’d be a lot quicker to complain in the future given the prices.