Sabaudia seems to be a purpose built holiday resort, particularly popular with local (Italian) tourists. As such, this is not an old town to visit, but a place to stay (to then go to Rome, Naples, Pompei, smaller closer villages, or just the beach) and some understanding of a few words of Italian helps ... and goes a long way in supermarkets and restaurants. During 10 days we did not feel that we were being ripped off as tourists, probably reflecting the fact that the town replies heavily on repeat local customers. The town has several supermarkets, restaurants, bars etc. and seemed to cater for families.
The beach is very long (I guess several kilometres), sand (good quality for digging/building), shallow waters (suitable for younger children, although it could be a bit dull for older children unless the waves pick up), with a lot of open public spaces (rather than organised beaches with umbrellas and loungers). There are very few buildings close to the beach so the impression is of being in nature. Parking near the beach was easy except at weekends.
The property itself was well maintained and looked as though it had been painted recently. For a holiday home it was relatively spacious and the kitchen was better equipped than in any other holiday home I have ever rented. Criticisms are minor: no hanging space for clothes in the bedrooms, just drawers; while the bathrooms were clean they could - in my opinion - do with some renovation to bring them up to the standard of the rest of the property.
WiFi available :-)
The owner is genuinely helpful and willing to provide advice and assistance, with a good level of English.
All in all a good place to stay. Just remember: July is hot ...