Hi Alex
I work in marketing and communications as my day job, so perhaps can offer a little advice...
I agree your headline needs some work perhaps something like 'Modern designer apart with balcony & a view minutes from Centre'. or something similar.
If you have already ensured your price is comparable to your competitors, I would have a look at your copy.
The description of your home is a little dry so you could work on that.
You don't mention you as a host at all, or what sort of visitor would be most suitable for your apartment. Maybe mention some key attractions within easy reach and have photos of them. Make sure your profile gives a real sense of who you are and you have decent profile pics that show you clear. What do you do, where do you like to travel, what are your hobbies. You have a photo of a building rather than yourself, which doesn't inspire confidence.
Your check in window is a little early - can you not accomodate guests who arrive a little later?
You can also get others to review your property who have stayed there but not as Bnb guests for example a superhost.
Best of luck.
Helen