Hi Krystina
There are many options for a getaway out of Sydney varying from 1 - 4/5hrs depending on where it is you would like to go.
I would highly recommend the blue mountains as it is a great destination and if you stay at a B & B it would create that romantic getaway your after.
i stayed at a B & B called Kalima in Blackheath in the blue mountains - it was afforadable and in a great location (the owners are lovely) and it's only bout 2hours drive out of sydney.
Kalima B & BThere is also Terrigal which is really nice but may be a bit too touristy for your likings
TerrigalThe surrounding towns of Newcastle like Belmont and Swansea are quite picturesque but there isnt much to do up there aside from the beach. these towns are rarely visited by tourists which was its appeal to me when i went there.
im not particularly clued on with accommodation in those areas but found this
Belmonthave you considered Jervis bay its a bit of a drive though
Jervis BayThere's also the town of Berry on the South Coast of NSW
BerryShellharbour , Kiama , Ulladulla & Bateman's Bay are great places on the South Coast of NSW.
you cant go wrong with Port Macquarie either which is north of Sydney
a good site for ideas is
VisitNSWhope that helps
