Hi Kate,
First of all I love the garden! And the beds do look really comfy and cozy.
As a photographer one of the first things I notice is the image quality. I think professional images will make your advertisement look more professional. Maybe with some focus on cute details.
I do also notice a green round spot behind the couch? For me it makes the place look less tidy/taken care off from the images. While it's not very hard to fix?
I do also agree about what's already mentioned about the kitchen/microwave. It really takes the attention in the environment.
And the bathroom rugs do look a bit messy. Probably because you washed them and the edges come up?