In order to complete the sale of the property legally, getting it through public notary (notar) is compulsory. Notary should be impartial and act as a middleman between the parties.
Notary is responsible to make sure that there is no pending issue that can halt the sale of the property. On the other hand the notary is not responsible to inspect the property and demand information which the seller has. But the notary's responsibility is to make sure the paperwork is accurate and the sale deed has been witnessed in the presence of the notary.
You have the authority to choose your notary also, if the notary speaks your language, it is advised to go for that. On the other hand your embassy might provide you with the list of translators that they recommend.