You can enjoy a cup of coffee both inside and outside, and the walking paths are very pretty and peaceful, so you can relax without worrying about others' eyes. However, if you stay inside too long it can get a bit boring, so stepping outside for a walk to change your mood a little would be great.
From the rooftop you can see trains passing by, and the place recreates the feeling of being among flowers and a forest very well, which makes the walk feel even nicer. It feels like a small escape from a tiring real life and a time to feel a bit more at ease.
It seems like a very suitable place to wash away unwanted negative feelings when you're pressed for time, and while enjoying a cup of coffee and relaxing you might also take the opportunity to reflect on the mindset you had while traveling.