I'm very thankful to Nikos and to his parents for all the help they provided. We stayed for one month, and get a lot of support and information from them, including very detailed and useful support in route planning to completely other part of the Greece by public transport.
I saw some bad review here, but we didn't faced any of these problems. AC work good, and there was no any limitations on it's use. Shower work good. Everything as expected. We had some minor issues first day, which was resolved very fast by Nikos parents, and next days was flawless.
The place is good and clean. Location is perfect.
The best city beach are 15 minutes walk distance.
Plenty of supermarkets, shops, stores, restaurants - everything can be reached by foot walk.
Agios Nikolaos itself is phenomenally amazing, real gem.