Wash the potatoes thoroughly, peel them, and cut into bite-sized pieces.
Add water and salt to a pot and boil the potatoes.
Drain the boiled potatoes in a colander and let them cool.
Cut the cherry tomatoes, cucumber, and red onion into bite-sized pieces.
In a mixing bowl, combine the boiled potatoes, vegetables, black olives, and feta cheese.
Add olive oil, lemon juice, salt, and pepper, and toss gently.
Garnish with parsley to finish.