What currency are property prices shown in?
In the currency of the portal's own country, exactly as the advertiser entered it. No price is converted.
Each portal shows prices in its own country's currency: euros on the Cyprus portal, reais on the Brazil portal, and so on. The currency belongs to the portal, not to the language you are reading it in or the country you are reading it from.
Prices are never converted. The figure you see is the figure the advertiser entered, so it is the one to quote back to them. If you want it in your own currency, convert it yourself at a rate you trust — a portal that did the conversion for you would be quoting a rate that was already out of date and a number the seller had never agreed to.
A listing whose advertiser did not enter a price shows Price on inquiry instead of a figure. That is not an error and it does not mean the property is unavailable; it means the price is to be discussed. Use the contact form on the property page to ask.
What Housing Market Group charges you, for anything, is separate from all of this and is not in local currency. See the Billing & subscriptions section.