The most important thing a newcomer to affiliate marketing needs to focus on and learn is *how to generate a large and engaged audience*. Without a large and engaged audience, or the skills to grow that, then affiliate marketing will be completely ineffective. Learn one top-level acquisition channel (partnerships, SEO, whatever) and then learn the middle of the funnel with marketing automation/email marketing to further convert people time and time again to different offers once they are within your network.
Cost per click was more common in the early days of affiliate marketing but has diminished in use over time due to click fraud issues very similar to the click fraud issues modern search engines are facing today. Contextual advertising programs are not considered in the statistic pertaining to the diminished use of cost per click, as it is uncertain if contextual advertising can be considered affiliate marketing.
But don't make the mistake of thinking this will be a passive source of income—you're on call whenever you have a guest and you'll always need to keep the place clean for incoming visitors. On top of just renting on Airbnb, consider offering your guests paid add-ons, like Lauren Gheysens', Royal Day Out in London, England—where she gives visitors a local's only tour of the city, complete with bespoke 18th century costumes.
Some good tips. I fully agree that it’s all about trust and it is always good to recommend an affiliate product that you have actually used. Why risk your reputation on a product you don’t know if it’s any good or not? If people buy one dodgy product from your site, they will probably never make that mistake again. That it why my blog strongly advocates ethical affiliate marketing. It’s the best long term stragey for affiliate marketing success.