Biggest risk is like fire inspector, city inspector or someone coming in and seeing residential use in a commercial building and an eviction following suit.
Might get away with an "artist studio" like user above aaidwith a work space in one corner and maybe a futon, basics in one corner and minimum appliances (mini fridge, microwave, kettle) it can't look permanent, which is hard.
Don't use the free ones, you're looking at downloading malware at worst or just ineffective at best.
I use Mullvad, privacy focused which is cool. No emails, no nothing. Your account is a string of like 24 digits and you add time on their website. They even do envelopes of cash and crypto or bank transfers if you're into that. 5 euro/month.