The next month I will move with my girlfriend to a new place in ZH, but because of work and short time, I decided to subrent my current flat (where I was living alone).
Of course I have already informed the current Verwaltung and they agreed on that, but I was wondering if there is any issue I am not aware of if I move my address to a new one in the same city and I have as a matter of facts two flats.
Note that I will not charge more than necessary for the old one, so I will not earn anything from the sublet.
I did it a few times when travelling for longer periods and it worked well. Just make sure to get a proper Mietkaution (and deposit it in an account for that), a documented moving in/out protocol and a contract.