I didn't make it!
I think it was called Hero's Respite or something of the sort. The house was north of the Imperial City, and it was on the map when the mod was installed, no quest necessary, you just had to go there. The place itself was a mansion that had a throne, a bedroom, a workshop with storage space, and a place to make spells and enchant weapons/armor.
Upstairs they had showcases of cool stuff, but you couldn't get to them, and hanging gardens that had plenty of rare plants. This place also had a Shopkeeper named Shiela that had a massive gold limit.