Here is another idea.
Le Meridien at the Sentral Station (also Hilton & Aloft nearby). Though not near any major sights, but it is extremely convenient as to take public transports to almost anywhere.
From the airport, just take the airport express train to the end station which is Sentral. Get out of the terminus and take an elevator up, then walk a short distance up to the hotel. If you call the hotel ahead, they might even send a bellman to meet at the station and help with luggage.
I stay there frequently, most recently last December. Nice hotel and they treat BonVoy elites very well.