I think this is a great way to get to/from st Petersburg with kids! We loved the kids friendly coach and already planning another trip! The facilities are great (play area, toilets, comfortable seats), the staff is well trained and the meal we had was adequate.
My only suggestion is that in Economy+ and above coffee (at least instant!) and tea (may be pre-made!?) should be unlimited throughout the journey (just like on some of the better European trains). It is not a great cost compared to the ticket price, but certainly will make the journey feel more of a treat. May be an idea for a new "jubilee service" celebrating 10 years of continues improvement :-)
Train number:
771Н
Travel date:
08 Jan 2020
Family traveller, Russian Federation