We just got back from Kos at the weekend, staying in Amfi's. The appartment is basic and functional, mostly quiet, apart from the times the odd group of people would walk past singing/shouting, but this wasn't too much of a probelm at all for the 2 weeks we were there as it was approaching end of season.
There isn't much in the way of facilities in the appartment, exact amounts of cutlery etc for the occupants, towels included are hand-towels rather than full size bathtowels, but these were cleaned every day, apart from changeover days (Sat/Wed). Beds were comfortable, but the noise from one of them creaking whenever whoever was on it moved slightly was unexpected (but you got used to it).
The lack of pool isn't a problem, as the Blue pool round the corner is excellent, the staff there very friendly, and food/drinks very sensibly priced and nice. A reception would have been a benefit, as it was sometimes hard to catch the owners if you wanted to speak to them - they are generally about at 12-00 until 14-00 if you need them, although you will need to speak greek, or be very good at charades.
The rep (Rob) was a bit of a tw@t, but this is probably because we didn't book any excursions, everything seemed like it was a personal tragedy that he had to do something/answer your question..
Would go back, and stay there, although would hire a fan this time, as it was crazy hot despite being end of season. | 
- UK