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This is the best train to travel from Delhi to Chennai and beyond to Coimbatore, if travelling in Sleeper Class. The time taken by this train is very less compared to other trains like GT Express and Tamil Nadu. Regarding Cleanliness we can say that if you have bucks you can prefer AC 3 Tier. But I travel to Coimbatore and this suits me best because you have next connection to Coimbatore in a very short time say 1hrs to 2 Hrs , namely Nilgiri Express and Cheran Express. But I do not suggest Nilagiri because if this train gets late then you have no choice but to go in Bus. So Cheran is best, You have 2 hours waiting time.
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and my family used to travel in Kerala Express which was very exhaustive and the food served in Kerala was also not very hot. So for me no problem and what more you can expect in 1245 which includes the Meals and Bed Rolls. So if you are too hygienic conscience then you can book in AC 3 Tier or 2 Tier.