Hi,
No one has mentioned area rugs, and I don't see any in the pictures. As lovely as wood floors are, several thick area rugs can be very effective acoustic absorbers, or thick carpet, and also thick curtains when they're partly or fully closed are very effective. Left open, they are minimally absorbent.
The rest of the advice from other forum members is generally good. Sticking good speakers like the M22s inside enclosed bookshelves like those pictured is the worst thing you can do -- highly colored and "boxy" sound will result.
Regards,
Alan
