Fantastic start... I've created several rooms with things in them. The only thing I've noticed is lack of status refresh. For example, if Lifx lights were turned on from a Logitech POP or IOS device, the status on the Web Controls doesn't change unless you manually hit the refresh button in Safari (in my case).
Feedback - Perhaps consider changing the name of the "rooms". I've created my "rooms" but I've also created and named "dashboard" where all important things I want an instant view on reside. Not sure if its possible in IOS Safari, but I know iRule can display full screen mode when using their remote App so if this Web Controls interface was built into the IOS Stringify App itself, you could launch it as a full screen control hub which would look great on iPads used in Home Automation wall mounts.
Once Flow Building and editing is brought into this interface, it will be the ultimate substitute for any central hardware hub.