The seats are semi clean in the Ac chair car. The tray tables are horrendous. They close the coaches in the name of cleaning and even after that the tray tables will have leftover food. If you are lucky you get a decent tray table. Most of them are hanging or broken as well. Bottle holders, magazine holders etc. is luck as well. Toilets are okay, but fans are not there, flush doesn't work. Sometime there is no european closets etc.
On top of this the normal seating ones (non AC) are very cramped. Seats are not wide at all so we have a very terrible experience if two medium sized people sit beside you. Can't even move your arm around.