Since you're attending BTS in สนามราชมังคลากีฬาสถาน which is their national stadium, you should be looking for places around bang Kapi, Rama 9, Huai Kwang or even lat Phrao. Din Daeng is also okay. I also suggest looking for a place to stay that's very close to MRT or BTS because it's just cheaper moving around😁

Also if you withdraw money from atm here, you get charged 220 Baht and that's the only thing that is super important 😄