Cleanest City - It is surprising that Trivandrum is 73 out of 250. But, that surely is not a good ranking. Like Aarem suggested, being in the Top 10 deserves to be called 'one of the cleanest'. Also, cleanliness is not just about 'clean', it is about pollution, waste treatment etc. I suggest that 'one of the cleanest' should be removed.
Best Airport- I am not sure what this means. This tag was given well before the new Terminal was inaugurated. I cannot understand how one could rate the old TRV terminals as one of the best! If looks is the yardstick here,most of the airports have modern terminals now and we should wait for a ranking of all the new terminals. Also, the statement does not say on what grounds it is the best airport - in terms of - revenue, traffic, profits, passenger traffic, facilities? If you would like to retain it, please be more specific and of course have the references ready.
Cheapest and Closest option - I would suggest rephrasing this to "one of the closest options to Maldives and Sri Lanka and the only direct option to Maldives. You can always use a connecting flight is what I am trying to say. For instance, someone in the UAE can fly to Colombo and catch a flight from there to MV. - MountainWhiskey