If you are considering booking a room in a private residence, you should be aware that while the price may look good, there appears to be no set "standard" for these accommodations. It's possible you'll be given something different from what is advertised with the booking provider, some may lack even the basics like bathroom linens, or you coud be forced to change accomodation locations without notice. If you are unhappy with the accomodation, the proprietor has the final say in what, if any restitution is made. The booking provider only facilitates communication between the guest and the proprietor, and that is where their obligation ends. If you want more certainty in what you're getting, stick to hotels or B&Bs.