I am sorry to hear this happened, but it is rather difficult to commment @Joe327 based on the rather scant information you have provided.
What do you mean by 'Airbnb was not helpful at all" ?
Is what you actually mean that they didn't pay out under the host guarantee? If not, why not?
There are of course exemptions to their 'guarantee' but these should be covered by your own specialist home insurance to cover short term lets.
How did your guests get away with robbing you and not being accountable. Surely this crime was reported to the police by yourself?
I do hope you left an honest review of these guests and that Airbnb remove their profiles from the system.
By the way your prices looks far too low for a one bed flat in that location. I would put your prices up.
What sort of personal belongings did they steal from you?