Jan's been searching hotels in La Paz, and finding some great options. We're looking for cheap or mid-range - which there means something less than $40/night. We'll be seeing a couple of good friends who are visiting there in early November. We're planning to spend a few days in the city to see it with our friend who grew up there, but hasn't been back since leaving (some 20+ years ago). That's special.
We plan to do a lot of hiking above 4,000m in Peru's Cordillera Blanca before going to La Paz; that means we should be well acclimatized to altitude by then, and not suffer a whole lot when we get to La Paz which sits at 4,000m. Apparently, there's oxygen available at the airport and in hotels, to help people along when first arriving.