How much a 80sqm apartment costs depends on the location on the coast and how close to the sea. Anything from €1000 per sq. metre and €3000 or more. Prices are higher still for waterfront properties (which are also in short supply). The condition of the property is less of a factor - basically unless you are buying a new build, you can expect to do some renovation work.
BTW 80 sqm is considered a large property in a country where whole families can live in 60 sqm. Evem 45 sqm properties are common.
