I have visited Symi a good many times but this was my first time at Aloustina's House and the accommodation was excellent. It was a challenge to find a reasonably priced house which could comfortably accommodate five single blokes, but this was perfect; the pictures on the website are an accurate reflection of the house; the kitchen seemed to be very well equipped (not that we used it much!) and the washing machine in the bathroom was a bonus (and, miraculously, did get used). Everything was very clean, communication beforehand with Seva was good, and, once we were there, Anna was also very helpful. The large terrace area was excellent for enjoying a drink or two.
The accommodation is high up in the old town, just off the Kali Strata, immediately next to Zoe's restaurant. For those not keen to climb the steps of the Kali Strata, the bus from the harbour stops about 50 yards away - albeit it's an uphill 50 yards!
As other reviews have noted, the one thing to be aware of is the nearby presence of the Scena nightspot only about 30 yards away! My understanding is that late music generally takes place only one or two nights a week. We seemed to hit a higher strike rate than that due to the combined effects of a bank holiday and a wedding party! The music is quite loud (and the singers of variable quality) and does go on quite late. Personally, I had no difficulty sleeping through it, but I think a couple of members of our party struggled a bit on occasions. It's certainly something to be aware of if you need perfect silence to sleep, but that aside I have no hesitation in strongly recommending Aloustina's House - excellent accommodation and very good value for money.