In reply to sarahlizzy:
If you're planning to follow the route as described in Cicerone book (i.e. descending via the glacier) then roping up and using a guide is a very good idea. We did the route 2 weeks back and stepped over at least 3 crevasses. There were parties descending unroped but personally I wouldn't have wanted to do that.
In terms of guides, have your the tourist office for where you'll be staying? Try phoning instead of emailing, they will speak English. In San Cristina the tourst office could book you a place with a guide and indeed on Monday evenings one of the guides was there so you could chat to them if you wanted.
These guys based in Selva do pretty much what you're after (min of 2 people for Marmolda),
http://www.catores.com/cms/index.php?en_Climbing_Courses_for_kids The San Cristina guides do something similar but I can't find a link for them.
Fingers crossed you get a good day, the views are awesome.