Everything to do with using your own website to advertise your rental property. Design, usability, hosting, getting listed on the search engines, optimising your site, pay-per-click, etc, etc.
Your place looks amazing. One thing, on your rates page I am confused. The dates look wrong. It seems to say that per week in 2013 is £400 and then the next date is from dec13-jan13 which doesn't make sense to me and is £1188. Are you trying to say that the rates are £400 this year and £1188 next?