Yes the peso has lost maybe half it value since then. At that time the $55,000 was probably around $1,200USD per month. If they pay for accommodations and health insurance like the original poster then $1,200 is more than enough to survive. No, they won't pay you any part of the salary in USD.
I personally wouldn't want to live in Quilmes. There are some nice neighborhoods here and there, but on the whole it is a pretty unattractive area to live. There are bars, nightclubs and gyms. Everything is a bit spread out though.