I think this must be the first time in my life I've actually seen modernism achieve a satisfactory combination of the industrial, on the one hand, and the humanistic, on the other - I'm not sure I love the nonskid flooring everywhere, and a Persian rug or similar might help tie together the conversation area centered on the divan, but the overall impression is nonetheless quite an appealing one. Based on the geometry of the space, I suspect the aural environment would be similarly pleasant - the high, airy volume would support close conversation without turning a more declamative style into a farrago of reverberation, and support a nuanced piano performance without swallowing quiet passages or ruining loud ones.
The salon being apparently the focus of the place, or at least of that photography I've found, it's hard to get a sense of the other rooms, and modernist architecture in general has a nasty habit of being a bear to maintain due to design features more oriented toward presenting the architect's vision than withstanding the loads placed on an edifice by its environment. But at the very least, should I ever find myself in the neighborhood, I'll most certainly have to find some way to visit.