I'm shocked, as all the interior shots I've seen looked like an apartment crammed to the rafters with LPs and gear.
I'm a firm believer that we can easily achieve very enjoyable, high fidelity (even if there are some intractable room modes and nonlinearities) playback in small spaces and acoustically sub-optimal spaces.
But that said, it always strikes me how cramped and/or acoustically awful many of these audiophile gurus' listening spaces are. Steve Guttenberg's room, from what I see in his videos, looks like an acoustic horror show, as does Herb Reichert's space. Fremer's space probably has some good albeit accidental diffusion going on, but as far as absorption and symmetry, it too seems like a trainwreck.
It just amazes me how anyone can take these guys seriously when they talk about how LPs cut from digital masters are garbage, how different digital cables sound different, or how different amplifiers have subtly different soundstages, when they're listening in spaces where the room itself is limiting, obscuring, and distorting all kinds of things that impact bass performance, treble extension, soundstage width, and so on.
Until last year I had a small listening space, perhaps 11 x 12 feet, with 7.5 foot ceilings and an asymmetrical room layout. I listened to music every day and really enjoyed it, and it sounded great. But then I moved into a new house where I have a larger listening space, about 16 x 21, with 8.5 foot ceilings, double drywall, a much more symmetrical layout, and modest ceiling treatments (two absorbers). With the exact same stereo equipment as I had before, I now get a wider soundstage, much better soundstage depth (both the perceived depth and the precision of instrument/vocal location within that perceived depth), and different frequency balance (better than before, but only after I experimented awhile with speaker placement). The soundstage clarity is sufficiently improved that I hear small details in recordings that I never heard before.
All of which is to say, these guys are IMHO far too confident that they're hearing all there is to hear, and therefore far too confident in the comparisons they make when they review and evaluate equipment.
It's ironic, because the usual canard that subjectivists trot out about measurements - "You shouldn't believe that what you can measure is all there is to the sound" - actually applies more to subjectivist approaches: they should not believe that what they hear in their spaces is all there is to the sound.