If you make money offline staying at home and working is the easy thing to do, you wake up have a coffee and you are already seated in front of your office before you know it. The problem is all the distractions.
This is something I struggle a lot with since I have a killer computer setup at home, throw on some tunes and kick up the air conditioner and there is no way I want to leave the house. However what follows is most likely 2 hrs of work and 7 hours of nothing.
Hint: Get a 150b True wifi card @ 7/11. Not all places have reliable internet so you can always fall back to the public True wifi if needed.
Any Hollys Coffee in and around Bangkok is a good choice. They all have free Wifi. They also open late.
Tom N Toms Coffee
Another Korean coffee chain that has wifi and some locations even open 24/7 so you can burn the midnight oil.
Plenty of co-working spaces all up and down the BTS lines.
They all offer basic hot desk or office spaces.
There is one in Onnut that I want to try (review coming).