Hi Gordanus,
Just noticed your post. I was recently in similar situation as I recently left a secure, high paying job to set up on my own. I didn't want to get tied down with the big overheads of signing a long term lease, kitting out the office etc. I'm actually subletting now from another co, but it is in a managed office.
The other co is fairly small in Ireland, and they rent two suites in a managed office block, on ebig and one reasonably small. I think the total cost is 4k, so I'd expect it is split to 1300-2700
Big and small offices at varying rates and I think only one months notice period. Broadband, phone etc all provided (you must pay for phone calls) and post is managed. I'm sure there are others like this out there but for info purposes this one is focussuitesireland in Harcourt St.