I have a simple template actually it’s a word doc. It’s a list of deductibles and I think that’s the most important thing to track. I do have an accountant and he knows the square footage of my Airbnb.
I also have a separate account that I use with AirBnB. So all payouts and when I purchase items comes from that account. Utilities- my Airbnb is 1/2 the square footage of my home. I use more water for my Airbnb than I do for myself. I’m only one person. All the water for laundry, watering my garden and (showers ) most of my guest 2 people, it’s a deduction. Also I advertise my garden my guest use it. They love sitting outside at the end of the day. I deduct the cost of landscapers maintenance. Obviously every country is different.
As a host you should totally understand what is the cost to maintain your Airbnb. It will help you figure out how profitable is it really. Are you charging enough to make it profitable? You can Google what are the deductions for AirBnB. They might have it on the site. Some host in the US don’t report their income from Airbnb, I do. I also have an insurance umbrella policy (liability), that’s deductible too. If one of my guest has an injury on my property that is a big liability and I’m not going to depend on Airbnb 100% guarantee coverage.
I would rather be over insure than under. Disclaimer I am not an accountant this is just a general information to research.