But according to what you said, it doesn't feel so good either. Anything, too much and too little, is inappropriate, emphasizing moderation.
There are mountains in the back and water on three sides. In fact, your description is not accurate What kind of mountain is it, an isolated mountain or a mountain connected by veins? What is water? Water, size and distance. etc
Moreover, room feng shui, as you said, is only in a big way. Small depends on the location of your building, residential design and so on.
Therefore, if the victim really wants to see it, it is suggested to invite an old gentleman to explore it with him.