Those would probably be the houses from the crown shop. You'll need to save up about 100,000 gold for each but just farm Halfang for a day and you should have it. Apart from that there are also some nice houses that come with game cards and bundles which have some extra perks like secret rooms, along with more space. If you're looking for a house thats not in the crown shop my advice would be that as you move up in worlds, the space of the houses increases also. I think the grand fortress from dragonspyre has lots of room and a cool light thing in the center but the outside is a little creepy. Hope I helped!
i recently bought the desert villa but am disappointed with it since it doesn't have enough room to my liking.
which house(s) has a lot of indoor rooms/space(more than the desert villa and royal playhouse)?
I would save up for the Red Barn house... The grounds are huge and the house itself is quite big. Also you get the added bonuse that all plants, if I am not mistaken, like that house. I ended up buying one for each of my wizards on all of my accounts. but then again I love gardening. (yay for level 9 pet snacks)