To stay at this house a car is necessary. Many car-hire services are available but it is cheaper to prebook in the UK eg with Holiday Autos.
Generally the house lets run from Sunday to Sunday as the flights to Kalamata only go on Sundays and many visitors choose this route.
Delightful Kardamyli and Kitries are nearby for authentic tavernas and swimming, and Kardamyli has a good selection of small shops, including a chemist, ATM, bakery, post office, supermarkets etc.
Please note that credit cards are rarely accepted locally.
For the best deals for flight-only fares direct to Kalamata (On Sundays early May to end of October only)
The other way to reach the house is to fly to Athens (then either hire a car, or take a taxi or the bus to Kalamata).
The best local weather site is this one for Kalamata, www.wunderground.com