@John7894 Go to checkout to be sure (where it says you won't be charged yet) but it is likely that the host is paying the Airbnb service fees (some do, many do not). Also worth checking the listing rules carefully as some places will charge extra for utilities etc. Finally you may see an extra charge for places like Venice that charge a per day fee per guest that has to be collected locally but these are very rare.
And really finally - If the price is very low (too good to be true) it may be that its a scam so read the reviews carefully. 99% of the time you'll be fine so don't stress on this one as long as you pay through Airbnb.