Family home by the sea, suits wild swimmer

We’re looking for a wild-swimming*, cat-friendly lodger for our family home on the coast between Portobello and Musselburgh. We have a very large 21 square metre furnished ground floor room. We’re a 25-minute off-road cycle from Edinburgh city centre, 20 seconds from the Firth of Forth, on major bus routes, with free on-road parking. Cost £600 per calendar month (includes internet, council tax, heating, loo roll and doorstep organic milk). We’re particularly interested in sharing our home with international students far from home…
*not strictly necessary!