Yeh I agree, if I had all that space I would put in a home gym or something not just leave it basically emptyWhy would someone want such big spaces? Asking for 6.7m and they've not done a very good job at staging it with all that empty space. It's an E on the epc so wouldn't be that comfortable for most of the year.
Photos look a few months old, why didn't they take them now with the tree leaves blocking out some of the many many windows overlooking it?