I'm almost hesitant to give this place a great review because I'd happily stay there next time I visit Tokyo and I don't want to find it's booked already :-)
It's obvious that a lot of thought and care has gone into this apartment. It's pretty much in immaculate condition, there are detailed instructions for everything in the welcome email (something which is often a problem elsewhere). The innumerable little Shiba Inu touches are everywhere, from the toilet roll holder to the dressing gowns (another nice touch) to the tea bags in the cupboard.
It's a very nice and polished experience.
My only reason for not giving it 5 stars across the board is simply that I've stayed at other places before which had a different balance of features, and maybe weren't as polished, but suited me even better for a slightly better price. But overall you can't go wrong here.