Hi Jill
The St Joseph is or used to by used by Thomson/Skytours and is an okay hotel. It's about 10 minutes away from the Luxor temple and about 20 minutes from Karnak temple, which is huge!
The West Bank, where you will be able to see the tombs in the Valley of the Kings etc is on the opposite bank to where the majority of the tourist hotels are and you can either take guided tours with your tour operator or do them independently.
The Pyramids are in Cairo (about 600 miles away) from Luxor. To get there, you would either have to take an internal flight (can be booked quite cheaply on Egyptair's own website) or take the train (around 10hrs of a journey).
The weather in January will be cooler (low 70's) and the evenings may feel a little chilly. I doubt it will be warm enough to swim in the pool unless it is heated.
The pool at the St Joseph is on the roof and there is a bar/snack bar there. The main restaurant is on the ground level and there is a reasonable bar downstairs. We've been in there to eat several times during our holidays to Luxor but there is a great choice of places to eat nearby.
I can recommend John & John's restaurant - situated inside the Gaddis Hotel, just a little further along from the St Joseph. Run by 2 British guys and you get a mountain of food on your plate!
Hope that helps some.
Regards
Cyprus100