Can I suggest Fanny, that if the cottage you like the look of is being advertised by an agent, that you do a Google search to see if you can find it advertised by the owner. We own a holiday let in West Wales, and used a well known agent to advertise our cottage when we first started, unfortunately come the pandemic, they treated both us and our guests really badly, refusing refunds, etc., so we gave up using them and set up on our own, as did a lot of other owners. It might also be worth looking at websites like www.simplyowners.net or www.independantcottages.co.uk, as lots of owners advertise there, and it will save you a booking fee, and mean that you won't have to go through an agent if you have any questions.