My spouse and I spent a week in Chania in June and loved our stay at Spiro's House. We had two friends join us for the last three days and two nights. The two-story flat was spacious, well appointed, clean and very livable. Even when all 4 of us were there it felt very roomy. Although it was hot during our stay, the flat stayed cool when closed up during the day. I had to do some telecommuting while I was there and the internet was strong and steady enough for me to participate in meetings in the US through the computer.
The location is awesome! We had not stayed on the east end of the Old Harbor area previously, but really enjoyed the access to the sea, delicious food and drink without the high tourism vibe of the central harbor. Because it is on a small street in a urban setting it was also close to the grocery stores, the central market, ATM's, etc. We also ate in for a couple of meals each day and the kitchen has a full-sized fridge, plenty of pots, pans, serving ware; even a kettle and two types of coffee making devices!
Eugene was helpful with each question and promptly answered even though we had a massive time change between us. It would not be a great place for people with limited mobility (two flights of stairs), but other than that I can not think of anything to warn future airbnb'ers about.