Tell it what is broken. It emails your letting agent, copies your housemates in, and chases them until it is sorted.
No app to install, no account to make. You message it like you would a person.
Every report, every email, every time nobody replied. Kept with the date it happened.
If you end up arguing about your deposit, or the council asks what you did about the damp, this is the part that matters. You cannot write it later. It has to have been kept at the time.
Free while we are getting started. No card, no app, no password to remember.