if you are renting it out long term 3 months plus you can manage it yourself, even people who rent out to tourists advertise and manage themselves, though I am not sure about the legal side which is a very grey area. the rent you receive would depend how big the flat is and where it is. maybe you should rent yourself in your chosen area for 6 months, have a look around and get an idea what rents are viable.
you will be supprised how your priorities change after living in an area for 3-6 months
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