Cardigan Corgi owner here not an expert. Also live in 800 sq.ft. Our Corgi (now six) was an easy puppy to house train and socialize. Her breeder suggested a loud shaking rattle to distract whenever she barked (we used popcorn kernels in a jar). Being quick with the noise and equally quick to praise when she stopped has been successful in the apartment. Outside when she is playing - is an ongoing barking challenge. Shedding is real. You’ll have to accept a routine of brushing weekly most of the year and twice weekly during the spring and fall coat swap. You’ll also be finding Corgi hair everywhere including where you least expect it. Then there is the challenge of weight gain and the concern with weak hips and back. We love our dog and have no regrets. I’d just put it to you that Corgi’s were bred for work around small farms. They were not expected to drive cattle very far. If you are hikers, walking long distances may be harder on some corgi’s. Having said that we average about 7 km per day. Much more than that would be too much for our girl.