IF Jenn herself had been renting out the rooms herself to make ends meet*, that would have been one thing. It would be crowded (6 people in one townhouse?) & I noticed even Jenn had a rack in her room for food sundries that didn't fit in the kitchen pantry. Cramped, but the partitioned area they made for Maddie was actually a little nook for herself. Maddie's space didn't have a door, but if Jenn had had 4 children each needing their own space, I think it would have sufficed.
I think we're seeing it from a very privileged lens to call her home "horrible" simply from the photos**- IF an otherwise non-abusive, non-murderous family with that many members lived in that townhouse, I would not judge.
* we know it wasn't Jenn but Jenn's dad, since he owns the place.
** I'm excluding the hair dryer/ "toy" in Room 4. I still don't know what