One needs to sit at least 8' from the speakers. The speakers need to be at least 1' from the walls and at least 3' from the corners.
The room has to be able to accommodate greater than 40 Hz bass extension.
IME, the Thiel CS 2's ported bass is a bit looser than most other Thiels, the high end can sound hard if they're toed in towards the listener. This room appears as though it could exaggerate those bass issues, and the nearness of the side walls practically demand toe in to avoid the early reflections that the Thiels wide sound-stage is likely going to aggravate otherwise.
Being nearly a cube, and being so small this room is going to be problematic with most speakers, but CS 2's will most likely highlight these issues.
On the other hand the Theil CS 2's with their 6 Ohm nominal, 5 Ohm minimum impedance, and 87 dB sensitivity are perhaps Thiels easies amplifier load (though IME the CS 2's sonic signature does require careful amplifier selection), and are reputed to be Thiel's most durable product ever.