As with all real estate transactions in Paraguay I would strongly encourage you to visit the property in person. Preferably you should do so with someone who has experience in Paraguayan real estate - both to help you figure out whatever repairs, etc will be needed and estimate those costs as well as to make sure all legal requirements are being met - many people have issues with land titles here. In addition, if you have someone you trust here I would send them to visit the property first, without you. This way they will be able to get a more realistic picture of the property. If you show up, especially alone without a Paraguayan contact, the seller will be more likely to gloss over any potential issues.
Good luck!
Natalia