My partner and I live off about 30k baht a month. So like 15k each. We live in a nice one bed condo with pool and gym, rent a bike and order food every day haha! The biggest expense for us was our education Visa's and initial house deposit but it's very doable :)
My partner and I are applying for ED Visas and we have been to a few schools to cover our bases. Most of them have said they need a month minimum and a few have even said up to 6 weeks. Hope this helps.
I only uploaded my first week's hotel stay and it got approved :) for reference I'm from the UK and I got the 60 day tourist visa (as I think requirements differ slightly depending on the country you are coming from)