You just have to be efficient with the space you have so if that corner cage makes more sense and works in the space do it. I can be pretty creative about making my spaces work but after almost 5 years here it's still amazing how much crap we stuffed into the old small 2 br house with a small garage. Still thinking about the best way to setup things and the rooms here and finding things that work. I have almost double the sf now and 4br with a nice mini barn for the overflow and we still have the "room" where all the extra stuff we might use gets piled.
Dobby has a nice cage on the vinyl threshold of the front door so he can make a mess and be part of the flock. Another bird would be tough but would probably clear out the junk room and do something there if it ever happened.
The cage and tree look really nice and works for everyone.