Hostels filter? / Enhancement request?

Hi folks

Thank you for creating such a great resource. 

I have a question. Is there a way to easily see where the hostels are when using the overnight filter? If not, could this please be considered as an enhancement request?

Many thanks!

What does NB mean on the map?

Hi folks. Probably a silly question but what does NB in the blue rectangle mean? I can't see it mentioned on the Key/Legend.

Thanks in advance.