I've stayed at a few:
The transit hotel at Seoul Incheon is by far the best. Its located airside of course and each sizeable room contains a double bed, TV
w/ satelite, desk, and restroom w/ shower. The hotel also has free Wi-Fi in all rooms, or free terminals in the lobby. You can stay for up to 6 hrs for only U$32.00. Its called the Air Garden Hotel and is operated by Sheraton.
I have also stayed at the Airport Hotel at MIA
. Its located in the terminal, landside, and is nothing to write home about. Plain rooms, no closet, and expensive, at U$89 for up to six hours (in by 10AM, out by 4:00pm). I think its geared mostly towards international pax arriving in the morning from Latin America and departing in the evenning for Europe.
, the Marriott (now Camino Real) is located across from the passenger drop-off pick-up. It's connected to the terminal by a a looong elevated walkway. Rooms facing the terminal on the upper floors have excellent views of the runway.
The Sheraton Gateway, attached to YYZ
's Terminal 3 is nice and a favorite of Priceline when you bid for an airport area hotel. It's located landside above the parking garage and is like any 3 star hotel. Its also connected by an elevated walkway to the terminal builfing. My bid of U$45 was accepted for this hotel.
Not all who wander are lost....