Belmont Station is a beer bar, so only go if you're looking for a place to get some work done alongside a drink. The WiFi is not great, nor reliable. Most folks caught working from here are tethered to their own devices. The WiFi they have is open (see WiFi notes) -- you'll be tempted to connect to "Belmont Station" SSID but that's their private WiFi.
Quiet earlier in the day. Expect a rush and crowd around happy hour into the evening.