We booked only about 2 months ahead and were happy we could snag a room on the rim. Had considered Maswik and Yavapai Lodge but after visiting both we were happy at the Thunderbird lodge. Granted it looks horrible from the outside (old college dorm?!) but the actual room was quite comfortable. We were in room #6208, downstairs, no view, 2 queens, frig, ,lots of plugs, coffee maker, nice bathroom. Check in and everything happens at the Bright Angel Lodge right next door. There is no wifi in the room and limited access in the Bright Angel Lodge lobby. When we ate breakfast at nearby El Tovar we were surprised they would not give us wifi access even though all part of Xanterra hotel group. If you are arrive early be sure to go ahead and do paperwork for checkin and they will give you the room key in the 3-4p timeframe.
Fantastic to be right on the rim for sunset and sunrise.
There is a shuttle stop right in front of the hotel.
We really enjoyed walking the rim trail both directions from the hotel. Had dinner and breakfast in the Harvey house cafe and it was fine and enjoyed the bar there too (Bright Angel Lodge).

We loved this location right on the south rim. Room was clean and comfortable. Checkin is at Bright Angel Lodge next door. TV reception is spotty. For WiFi you will need to go to Bright Angel lodge lobby to access. Parking can be challenging. You may want to ride the shuttle, once you park your vehicle. I suggest booking a room if you can find an available one. The location is close to all the south rim village area offers. You can walk to everything. If you want to hike the Bright Angel Trail, this is a convenient location. Shops, restaurants close by. It is also quiet and cozy.