Solid two thumbs up for Kostas Chrysoullis from a new forum member (hi folks!), long time lurker, first time poster.
We're just back from a fortnight in Crete, 5 nights of which we spent in Plakias, in the Ouranus (-chuckle-) Studios end of the operation.
We'd booked directly by e-mail after much browsing on this site and others, and ended up in a truly massive one-bedroom, one-livingroom/kitchenette apartment with both E and W facing balconies, that could easily have slept 5, and probably 8 if there had been more beds. Beds were comfortable, especially the fold-out double, fridge and hob were decent, doors and windows were sturdy and the west-facing balcony (overlooking the Miniokos taverna) was enormous. East facing balcony was smaller but had a sea view, and a great view of the Far End cliffs. A bit short on furnishings (which only made it seem larger), but very clean and well finished.
Only possible negatives were that the cleaning staff were distinctly over-enthusiastic (Is 9am really the best time to clean holiday accommodation every single day? Sleepy pregnant wife was not amused), there were only three working lightbulbs in the place (but with a bit of ingenuity that was enough) and there seemed to be a lot of late-night cars screeching past at implausible speeds for such a tiny road (which at least stopped us getting homesick) . We've done a lot of traveling all over Greece, and Ouranus ranked very highly indeed, if you'll pardon the expression.
The apartment was just a minute from the main Kostas Chrysoullis 'complex', where we and our toddler throughly enjoyed the small but deliciously cold and astonishingly deep pool, a good (inclusive) buffet breakfast and a very friendly mix of staff and guests. Best of all, it's only 2 minutes walk to the front and beach.
Oh, and it's in Plakias, which could conceivably make a cardboard box seem appealing.
PS Edit: Sincere thanks to everyone on this thread and others for their advice and observations. Planning a trip with a toddler and pregnant missus can be a bit of a worry, but this community helped me make a good decision in going to both Plakias and Ouranus Studios.