Short term near sea or lake

I'm looking for a room for a few months, walking distance to the beach if possible although I do drive, i'd prefer to be very near the beach. I am training to become an Open Water Swim Coach at the moment and thus would like to be near the sea.
I am currently receiving UC and this would cover the rent up to £100 per week. I am also looking for some work so if you need any help around the house or walk the dog or house-sit would be welcome at reasonable rate, negotiable. I'm happy to move to a new area to explore.
I am easy-going and like to share with alike. I also do quantum healing for which I may have clients around so this would preferably be ok with you (one client at a time).

Thank you
Basha