Three of us (husband, wife, 14-year old son) stayed in Sumac Wasi for 5 nights (2 different rooms - 3 nights in one and 2 nights in another) in June 2010 and found it be conveniently located but very basic. It is in a charming old building, but it is very cold inside and the breakfast area was like a fridge (admittedly it was mid-winter). The beds are a bit lumpy and the first room we stayed in had no window outside - only a window to the corridor where people were walking past. Lighting in the rooms was dim and it always seemed to be dark and gloomy. Breakfast is included but very meagre - we were always hungry. However, it is very close to Plaza de Armas up a charming pedestrian lane, so it is very convenient. Staff were pleasant and friendly, but spoke very little English.
For details of our stay look at http://PaulKilfoil.webs.com/2010.htm.
All in all it was OK, but a little overpriced.
