leon st 150 here its okay but nowhere near as big as the octavia, which i kind of wish i had got.
use a towbar rack and took four of us with gear to afan no problem the other weekend so pretty good.
driving is nice I have the FR so get different modes, nice and nippy. Mate with an S3 said it felt torquey when loaded up so pretty good and computer says average of 50mpg over the 9k i have done in six months!
Not tried a bike in but has a weird floor where you have the boot loor high to make it level with the rear seats for flat loading but that makes the boot quite a bit smaller.
I would say the Octavia is far more suited to bike inside but the Leon (in FR mode) is a smaller sportier car i my opinion (only test drove an octavia VRS TDI)