I flew cityflyer 4 times, AMS-LGW v.v. on their RJ-100 and ATR 42 or 72(can't remember)
They manage to put 6 seats per row in that aircraft (RJ-100) and I do NOT recommend a window seat, your elbows and shoulders will be rubbing the window on one side, and your neighbour on the other. eating on board is almost impossible. Highly uncomfortable, but were only short flights. Better fly their ATR with only 4 seats per row but noisy aircraft. Service is rushed, obviously because of short flights. All of these flights were before 9/11 so I don't know if they had cuts as far as service. Seems unlikely as there was hardly any service before. Food served to me on a morning flight to and from LGW consisted of a paper bag with a croissant and a juice.
All flights had an on-time performance.
All in all I'd say you'd be better off flying the intra-european flights with Easyjet. Why? Get a burger at the airport before flying, you'll get no service, so you can't complain about it, on a more comfortable flight. But I suppose you have bought all flights in one go... and thus fairly cheap. (How much DID you pay???)
Anyway, have fun in AMS, beware of pickpockets going to and from airport if you go by train!!!!
GELUK IS GELUL MET EEN K