If you pack water and snacks, plan to spend about 6-7 hours inside Machu Picchu. Both days I went, I was there at 6am sharp, and returned to Aguas Calientes by noon or 1pm. Around noon, Machu Picchu starts to get REALLY crowded with tour groups.
In town we stayed at the conveniently located Casa Machu Picchu. It has free breakfast starting from around 4 in the morning, and a beautiful view of the river behind it.
Spend some time exploring Aguas Calientes village during your one week in Peru too! Aguas Calientes has a huge souvenir market. Here, you can haggle for beautiful Peruvian-made goods including table cloths, llama fur hats and scarves, and other knick-knacks. There are also some hot springs nearby to rest your sore muscles.
I want to see Peru and Machu Pichu so badly! I had recently read that the influx of tourists there is causing some logistical problems, and they may have to limit the number of visitors per day. I would love to get there before anything like this happens. Your itinerary was very helpful!