European Trademarks

It is very difficult to patent a computer based invention. The rate is %90 refusal as i heard from an EPC patent examiner during a congress. Your main question must be: "is there a technical solution to a technical problem?".

A computer based invention may contain technical and non-technical parts. We can see the computer (or a mobile phone) as technical but the authority sees this technical part as obvious. Your invention must contain technical solution which is above obvious (Prior art).

I don't think an application which is samely used like airbnb to be patented but recommend you to argue it with a patent attorney.