Thai Language Schools - Recommendations? (Bangkok)

Hi InterNations!
I have just moved to Bangkok from Melbourne, Australia.

My job is 80% English based but I will need basic Thai to get around and also for meeting Thai customers.

I was hoping some English speaking expats could recommend a school that teaches at night?

A quick google search returns many results, so I'd appreciate your advice on which school are recommended.

I am working near Asoke BTS and living near Ratchadamri BTS.

Loving Bangkok so far!
Stephanie