Hi Fayezah,
Nice to meet you here.
Firstly, you have not mentioned you are looking for property sites in which country.
Secondly, as for viewing a property website you do not need any registration or paying off as such. Although, you may need to register or subscribe (pay-off) in some websites; if you wish to take the services offered.
Thank God! we need not pay for the
services offered by this Forum
As for the attributes of a good site, I would bank on one which has superb usability features rather going for something too craped up with unnecessary features and also one which respects a users privacy.
Let me know what you think.............