There is a river (east-west) to the south of the balcony. Is it good for feng shui?

It depends on whether the river is in front of or beside your house. It's good luck to cross your door!

It depends on whether the river is a gutter or a stagnant pool. If it is stagnant water, it will be ruined+unlucky!

The winding water is full of children with feelings. If the river facing your door is like this, your children and grandchildren will live a long life!