First-Time Buyer: Renting to Offset Housing Costs

If I own a studio apartment as a first-time buyer, which is my primary and only residence, and I rent out the entire apartment for up to 180 days a year on Airbnb while I am abroad on holiday or visiting family to cover housing costs (mortgage, service charge, ground rent, bills), and I live in the apartment for the rest of the year, which tax scheme or classification would this arrangement fall under?

Hi,
You would need to report the rental income as income from property.
Thank you.

According to which scheme? Rent a room scheme?

Hi ,
 

No rent a room will not apply as you are letting out the whole house whilst not living in it. You can only claim actual expenses incurred whilst the property is let out . Thank you.

That's because it is a studio so I have no other choice to live in it even if I wanted. Can I claim my mortgage, service charge, ground rent, and bills as expenses for the period of when I don't live in the property? All of these are my actual expenses and the reason for letting out.