The apartment at Huespedes Jaén is 100 euros per night for 3 bedrooms with 5 people. You could do that plus a plain room for 2 at 40 euros, giving 140 euros for 4 cozy bedrooms. But then you add on yet another person and room...

We liked Huespedes Jaén . Maybe a mile to Plaza Mayor, and close to other good places. Both central and quiet.