The author literally labeled that room the "Upstairs Office".
The rest of the house (kitchen, family room, etc) that's not dedicated to LAN computers looks like a normal Euro/Scandinavian type of clean minimalism aesthetic which a lot of people like.
My home currently has a lot of "traditional" style furniture and decorations hanging on the walls which some might call "warm & cozy". But others would disagree and think of it as "grandma's house" and as I've aged, I tend to agree. I'd like to eventually dial it back and redo the interior to be more minimalistic but I have other higher priorities than remodeling the house.
Saying that, I'd live there in a heartbeat.
I mean, the American Express office looks like a track stop or mall you will find along the highway.
That said, I thought the games room with rows of hide-away PCs looked like a call centre or at best a 90s internet cafe.
It’s likely just his preference. My wife and I also rather like a relatively “IKEA” aesthetic so I think it’s just preference.
Pretty much what you'd expect from techies that never really thought too hard about their living space beyond functionality.
I mean, I'm the same, so no judgement, but I did hire an interior decorator for my own place. Definitely worth the money and my house has all kinds of funky fun stuff and colors going on (on top of being 130 years old and super wonky everywhere, ha ha).