Issue #32634: IntRoomStoneMediumAcousticSpace [ASPC:000C5B6D]
Per our Discord chat linked below these interiors are like the one displayed there and thus their XCAS - Acoustic Space should be IntRoomStoneMediumAcousticSpace [ASPC:000C5B6D].
I ignored all that could go either way e.g. upstairs wood and downstairs stone.
AngasMillAerisHouse "Aeri's House" [CELL:0001620B]
AngasMillCommonHouse "Anga's Mill Common House" [CELL:00016209]
FalkreathBarracksJail "Falkreath Jail" [CELL:000EF324]
FalkreathCorpselightFarm "Corpselight Farm" [CELL:00013A72]
FalkreathDengeirsHall "Dengeir's House" [CELL:00013A78]
MorthalAlvasHouseCellar "Alva's Cellar" [CELL:0010CEEA]
RiverwoodGerdursHouse "Hod and Gerdur's House" [CELL:000133C7]
Here's a drag and drop esp if it's helpful: