The flat is absolutely beautiful and far better than the price would indicate. Ragusa is also beautiful, although you need to give it a chance. Eating pizza on the balcony in the evening overlooking the town all lit up is magical.
Marina di Ragusa is 25 mins away and has a great beach and some fantastic restaurants.
I would also highly recommend getting a Car for Sicily in general. Using the car from Ragusa we were able to visit Agrigento (valley of the temples), Marina di Ragusa, Siracusa and finally Mount Etna (although we stayed 2 nights on Etna). Driving in Sicily is not for the faint of heart!
There is a very nice restaurant within 5 mins walk and small supermarket/cornershop within 15 mins walk.
Very highly recommended over all.