My husband and I had 12 hours between flights to kill so rather than waiting around the airport we checked in to Hotel SK Crown Park.
Pros: It was close to the airport, modern, clean, had great WiFi and a good restaurant. It was also important that we were able to pay for taxis, airport transfers and food on credit card as it was our last day in India and we had very little remaining currency. Customer service at the front desk and the restaurant was great.
Cons: Not really a con for us because we were just using a room to chill, but the local area was unremarkable (in my brief impression) for touristic endeavors. The big con was the pricey taxi transfers. When we arrived in Delhi two weeks prior, we stayed in Chandi Chowk and our hotel gave us a free ride to Old Delhi (45 minutes +/- in heavy traffic). The shuttle to this hotel was about 20 minutes on an expressway, and pick-up cost 600 rupees + parking (200 rupees - despite the posted airport sign saying 30 minutes is only 80 rupees) and drop off cost 500 (plus tips of course). So at the end of the day, the airport transfers cost as much as the hotel room.