Base Camp at 4300 is fine, but you need to get up very early to reach the summit. You can also camp at waht is called Moraine Camp. At about 4800m , this will save some 2h00 of sleep. When we where there, a bunch of people, including a Peruvian guide, got their stuff stolen (sleeping bags, boots, etc). I recommend hiding you stuff before going up.
Only map available of 1997 (2ªed): IGN of Perú, Huari, serie J631, Sheet 1452 (19-i). 1:100.000. This map don't had the names of the main mountains, but the lines of level are O.K. (Vallunaraju or Ishinca don't appear with name in the map)
The road must have improved a lot, because I 'only' paid 120 Soles for the taxi to drive me from Huaraz to the refuge (which, by the way, is currently closed for business as it is being upgraded).
On the way back, I hitched a ride in one of the several cars driving people in and out, and paid 50 Soles.
Thank you Rob for the updates. I posted them already. I appreciate it!
Now in 2017 the robberies are still there!!! They came up to the high camp at 4450m while we were on the summit! Take care and watch out! And don't leave your staff there unattended! I'm sure now, that there are some locals who spy the people while going up to the High Camp! Anyway....it's a beautiful mountain and a very good view!
The summit elevation reported by the page is off by 100m. The correct summit elevation is more like 5680m.
I made the summit of Valluna on July 10, 2017, using a guide and porter. We camped at the moraine - 4945m - after a hike of about 2h from the trail head. Short, but very steep. The glacier is about 30'-45' of relatively easy rock scrambling from the moraine camp. We left the tent at 2 AM and reached summit at dawn (6-6:30AM). Spectacular weather and views. There are a couple of steep snow walls to climb on the way to the top - nothing dramatic. One is about 6m tall and we rappelled down on the way back (but it can be easily down-climbed). The road to the trail head is in dire conditions - big rocks and huge holes - but my driver made it (slowly) with a Toyota Corolla station wagon...