Hello @Marta851
I'm afraid no-one here will be able to advise you on how much to charge or whether it is worth you listing your place. You will need to do your own market research on this yourself. There are so many variables that only you will know.
1. Do a search on Airbnb to see how much similar properties in Dunmow are charging
2. Speak to your local tourism office about tourism footfall figures for those staying in your area (if tourists are your target market
3. Use something like AirDNA to look at occupancy rates.
Then put together a budget with set up and ongoing costs and an estimate of income. This will help you understand whether it is likely to be worth you listing.