To improve ranking of your website you will have to do seo of your website.Seo plays an important role to get website ranking.
It is depending on keywords that what kind of keywords you have select your best keywords through google adwords. Then set your keywords in meta tags as competitors and set your content as quality work. After that focusing on SEO strategies. Which you learn through video tutorials e.t.c.
For getting telephone number you must have landlord house address,must know their name..Then you can get easily in corfu greece Or one of your friend lives in greece they may help you to find phone number for an apartment.