Chickens in small garden

Hi all. I have a relatively small garden in NW England (approx 30sqm in an L shape). It has been a lifelong dream of mine to own a very small flock of chickens, and feels more important than ever with the world as it currently is.

Does anyone have experience of doing this in a small urban garden quite overlooked by neighbours? My concerns are that my garden will no longer be a space to sit out and enjoy with my children, and I'm also worried about attracting pests. Would love to hear from anyone with experience of this. Thanks!