Right daft question time if I'm looking at apartments online and expenses/expansas are referenced are they monthly or annual? Almost certain it's going to be monthly but I'm seeing the likes of 10k expenses on 20k rent which got me thinking(hoping) it might be annual. I know that these are to cover maintenance in shared quarters where you have the likes of security, pool, gym etc.
The expenses are only for long term rentals and are monthly. I currently pay about 4K expenses per month on a 14K lease. These are not necessarily stable either - my expenses had climbed up a bit over 6K for awhile and have come back down recently. I live in Recoleta about 5-6 blocks from the Plaza Vicente Lopez mentioned in another post.
I wouldn't doubt it if prices have gone up as high as you're seeing in Recoleta, but I don't know for sure. My apartment is big, 3 bedrooms + office, maid's quarters, kitchen, dining room and den (not very easy to find, really, at least not at an affordable price, in Recoleta). About 170 sqmts. (5 of us living there - my wife and 3 teenage girls with all their living space requirements). I would think for a family of 4 with two wee ones you could find something much cheaper. Recoleta isn't all fancy, high-priced quarters. A modest 2 bedroom of 80-100 sqmts would probably be found at a reasonable price, long term and maybe even short term.
You asked about temp vs long term - it's a tough question. It may be difficult to find a single temporary rental for two years. Not saying impossible, as tourist rentals are down significantly and you might be able to find someone that will do so. But that also gets into the laws regarding temporary vs long-term contracts. Maybe your company can help out finding a furnished rental for two years, be it temp or long-term. This may be one of your biggest issues overall, along with furnishings.
You could probably furnish a smallish apartment for 3-6K dollars (maybe? I'm thinking a lot of used stuff. I could be wrong on that - I did it for about 2500 7 years ago, all used stuff from an expat moving) and if so, you'd probably be better off doing that for two years if you find a long term and can't find one furnished, rather than bringing in your own stuff. You will have problems and cost bringing in your belongings. Corruption, hold-ups, no real fixed cost, etc. You can sell off your stuff when you move and recoup at least some fo the cost.
That may be something you want to bring up with your company as well, is a moving allowance applied toward purchasing furnishings if you can.