I recently replaced my windows, including a double hung over the kitchen sink. They're made by Great Lakes Window. They can be adjusted to be tighter or looser for opening. I had the one over the sink set looser than the rest of the windows, and I no longer have to struggle or strain my back. I can even use one hand, but do use both since I have a bad back that gets aggravated easily. I hadn't opened my old window in over 10 years.

Other brands might have a similar feature too.

A casement (crank) window is a good idea too, if a window that swings open to the outside isn't an issue with your condo board.

Here is a link that might be useful: Great Lakes Window

Check with your Condo board before going any further. They typically have contractor lists that they require you using and specific manufacturing lines that you should use. Start there and make your decisions. Casements are very common over sinks and more easily operable when compared to double hungs.