Ah, you'll need to be a bit more specific than that! There are several Blue Posts in Soho - reputedly named for the wooden posts which marked the bounds of the hunting grounds of Soho (itself named after the hunting call).

But if you're talking about the one on Rupert Street, then I'd agree with you - cosy but very friendly, and with decent home-cooked food too.

I'd also recommend as worth a look:
The Sebright Arms in Bethnal Green - a bit of a hipster magnet, but they have lovely local microbrewed ales, and incredible burgers.

The Princess Louise on High Holborn is another Sam Smith's place that's cheap and cheerful and looks lovely inside, though is almost impossible to meet people in (thanks to the multitude of privacy screens). The gents' downstairs both looks and smells Victorian. The Crown (just up New Oxford Street) may be a better bet if you actually want to find someone, plus it has a small outside area.