We stayed for one month and Elena was amazing, from our arrival to our departure. Recommending places, helping us get a discount on a quad (ATV) rental, replacing our malfunctioning coffee machine, always being so quick at replying - the list goes on. We also had everything we needed and more, so can't really think of anything else we could have asked for.
We loved the location of Elena's house. We wanted to get away from the city for a month, which went as expected. Although there's not much to do apart from beaches at walking distance (and the minimarket, god bless) and although people recommend cars for the island, we did just fine without one (but we did work full-time 3 weeks, so keep that in mind). We rented a vehicle for 4 days and saw the northern part of the island (Noussa and the amazing beaches around it) and did the Byzantine route (Lefkes - Prodromos). Other than that, there is a bus every 2h or so to Parikia only 5mins away (half of them also go through Aliki) and we even walked to Aliki a few times (around 1h). The ferry to Antiparos is only a 35min walk away as well, and after a 7min ride you arrive in the port of a small, but lively town filled with tavernas, shops and bars.
All in all, we loved both Paros and Elena's house - would highly recommend to anyone!