Being a Finn I’ve seen a fair few saunas. The layout is weird, but doesn’t look very bad to me. Pretty close to what you’d expect from a sauna in a house. Of course, with all the money that went into that house and the space available, they could have done a lot better. It’s not fancy in the slightest, unlike the other ones you linked. But it’s recognizable as a basic sauna, which is not a given for American saunas.