Be sure the condo will allow you to install your own Wi-Fi. Not all will. Most condos have Wi-Fi, but it’s not strong enough for all the users. Condos also have water and electric together and can be paid via a scan with your thai bank. Since you said for a year, you’ll have a bank account as it’s required for your visa. Just ask a lot of questions at the condo and try their free Wi-Fi.
Do you have your visa already? Pretty sure they will deny your application without proof of an exit ticket. That is what they did to me the first time I came here. I just bought a cheap throwaway ticket. Worked fine and I got my visa.