I keep most of my kegs at about 55 - 60 when they are not in the fridge (I can only fit two).
This is a decent temp to pour a stout or other English ale and they are not overly foamy. But I've found it's too warm for the Belgians.
If I'm planning to have a couple or if I'm taking some to a friends, I'll fill a two liter as mentioned above and give it a short charge of gas. I've also filled growlers at this temp and they seem just fine as far as carbonation once chilled down a little more.
Now that it's winter, I'll struggle to keep that room of my basement as warm as 50. Which is nice for beer but not so nice for the wine.