As was noted above, your positioning of your offering is very poor.
A me-too business - especially against a well funded giant like Airbnb - is utterly worthless.
However, a business which caters to an existing underserved demographic of customer of Airbnb is not. This is called specialization.
And the way to market is to utilize social networking to promote your message within the demographic you are seeking to provide a specialized version of Airbnb to.
Your offering and message must be that Airbnb is lacking in some significant way or ways to serve said demographic, but that your company fixes this. Frankly speaking, I have a hard time seeing any such opportunity vs. Airbnb which said company isn't already attacking or could easily attack - say business travelers or travelers with dogs/children/handicapped/vegan/religious ad nauseam, but that's none of my beeswax.
Your marketing efforts thus should be towards business travelers such as Flyertalk, pet owners via Dog/Cat forums, parents with young children in childrearing forums, EEOC departments, etc - or in other words, do exactly what Airbnb did but with a far finer grained focus than a huge generic marketplace can offer.
A great example is a company I saw recently which was specializing in Uber for children. That company articulated very clearly how the needs of a service for driving children a la rideshare is different, and has a very different business model and operational strategy.