The one in Vvardenfell was the first apartment I really wanted to decorate but the beautiful load screen was a slap in the face when it finished and I loaded into my measly 30 items. If they gave me a bigger version of that apartment I would cry!
Someone posted in another thread on this topic a couple years ago that the reason the inn room limit is so low is because more players will have them. Not everyone is into housing and thus spending lots of gold/crowns on them. But, all players have access to the inn rooms - for free if they have enough characters. So, they have a low limit on those since all players have easy access to them.
Don't know if that's the reason or not, but I'd love to see an increase to the limits on the inn rooms. Even 25/50 or 20/40 would help.