The second problem facing small holiday home websites is converting visitors into customers - even the best websites with perfect information, options, checkout system & online payments will be over the moon with 5% of visitors becoming paying customers, 1-2% is probably nearer reality.
Getting website visitors is easy compared to converting them to customers - you can buy more advertising, place adverts in holiday cottage magazines, advertise your holiday home at the local newsagent or start a Google AdWords campaign, but if you can't get these website visitors to book, it will be all money down the drain. Not being able to convert visitors to paying customers is the number one problem for small business websites and why they fail or fall into disuse.
If you opened a high street shop, you'd want plenty of footfall, people would come in, look at your products, check the price then go to the till, pay for it and leave. If you opened a shop the same way most holiday cottage websites are run, there would be no sales assistant, just pictures of the product on the shelf and a book near the door saying "Contact The Owner for stock and the price of the product you are interested in and we'll get back to you". You'd go bust within a month.
If your holiday home websites relies totally on people filling out a form asking about availability and waiting for a reply, only a few will bother to ask and even fewer will go ahead and book.
Most people will have booked airline tickets online - it's the number one way to do it. You can easily compare routes, times, connections, prices with near 100% certainty that when you decide to book, you'll have paid and printed out your tickets & boarding pass 10 minutes later.
People's expectations change, today they expect to visit a website, find all the information, choose their options, pay online and get the confirmation email 5 minutes later. If they can't do that on your website, they will go to another one that will.