Yes, I realised that after I posted. I can imagine people forever tripping on those stairs carrying things down to the sitting room. I never want the spa things either, but maybe an outdoor sauna would be ok. I'd convert the yoga thing to an office/library and the cinema room to a sitting room, and maybe level up the sunken bit to make it level with the kitchen and have the whole thing as a family room with seating and dining areas off the kitchen.
I can never remember how to find the bit where they tell you the running costs, but I'm guessing a gardener is a must. There's half a million in cash, too, so that would pay for a few years of gardening, I suppose. I couldn't be arsed with a swimming pool either, specially an outdoor one which could only be used a few times a year and would need constant maintenance.
It's too far from my home to have it as an occasional holiday place, but I think the current design is more suited to that than to a permanent home. It would probably rent out easily enough, so maybe I'd keep it for a year or two, visit now and then and rent it out for holidays the rest of the time, then sell it.