This is simply amazing. I love the light you've captured and the monotone colour is brilliant. It looks like you put time in finding the perfect time of day for this photo.
The view in the background is also beautiful, but blurred enough that it does not distract from the photo, but instead adds to it. This would be a gorgeous view to wake up to!
I especially like the tones captured in the saucer holding the cup. The shadows and highlights are so smooth and lovely there.
The only critique I have is a very small one, and mostly based on opinion. It's that the cup isn't exactly centered (which is fine), but it also isn't quite off center enough to look like it was done on purpose. I feel like if it was pushed slightly more to the right it would make for a better composition. I think some people like the positioning, though, so that may just be my view.
Overall, a beautiful photo! Keep it up!