We had an excellent stay at Mariella's beautiful apartment in Ortygia. It is very light, beautifully furnished, and perfectly located.
I stayed on the sofa bed which was very comfortable, as was the master bed. There are 3 balconies from 3 of the windows, one with table and chairs which we used often and gets a lot of sunlight. There is a small beach just metres from the apartment, and walking up via Roma you will find many shops, bars, cafes and restaurants. One of the best restaurants we found happened to be metres away - Le vin de l'assassin.
Mariella's apartment is round the corner from her own apartment. As I did not have her phone number and was not sure which flat to buzz, we were waiting outside for a while. Eventually we asked a neighbour who told us which flat to buzz, but it would be worth asking for this before arriving.
The flat is fully equipped, however both the iron and hairdryer has very wide pinned plugs which we could not get to fit in the sockets. We did eventually get the iron plug in, but pulling it out was quite scary as it felt like the wall was going to come with it. Perhaps bring your own hairdryer. As the flat has old plumbing, be aware that toilet paper goes in the bin rather than toilet. This did not bother us much, but may affect other guests. I have seen some reviews mentioning the wifi. I suspect the router is in Mariella's apartment which backs on to this apartment - I found if I stood by the kitchen cupboard I could connect on my phone, and it would work within the kitchen. It did drop out a bit anywhere else within the apartment.
Would definitely recommend and hope to go back when next visiting Ortygia (beautiful island!).