We had a lovely stay. The flat felt airy and spacious, plenty of room for our little family of four. Nice and clean upon arrival. We really appreciated all the little extra touches (shampoo and things in the bathroom, a selection of cereals for breakfast, etc...). And the kitchen is particularly well appointed.
We did notice the train but thankfully, it didn't disturb the kids through the night so it was fine. We enjoyed ourselves immensely.