Finance minister pledges to "reform Greece deeply" as deadline for €450 million loan repayment to IMF approaches.
The offer from Antonis Samaras has not been met with an enthusiastic response from Syriza.
Visit will focus on lifting Russian embargo on Greek products and improving energy cooperation.
Athens is rushing to get the list ready before state coffers run empty, expected in a few weeks without more aid.
It was unclear if Greek Prime Minister Alexis Tsipras and German Chancellor Angela Merkel had narrowed differences on economic reforms for Greece.
German Chancellor Angela Merkel stressed no money would be released before Athens implements budget measures and reforms.
The couple from Hamburg donated the money when they visited a town hall in Nafplio.
Pablo Iglesias is on a mission to save Spain.
Bond-buying will benefit peripheral economies such as Spain and Italy, while Greece is marginalised again
The Greek PM is optimistic they will find a solution and believes the problem lies with Europe.
Greece sought advice on economic reforms as the Greek PM criticised the country's creditors.
Plummeting euro value driven by Greek uncertainty and ECB's quantitative easing programme.
The warning comes after Germany refused Greece's demands for €162 billion.
Satirical video reveals German terror of Greece's rebel finance minister.
The Greek finance minister says other European governments will suffer if others are 'asphyxiated' like his.
European Commission and International Monetary Fund accept Greek reforms as a 'valid starting point'.
Greece could run out of money by end of March without new external funding.
Experts are concerned that negotiations over Greek debt are ignoring the country's strategic importance.
Greece seek a loan agreement extension but Germany insist they stick to terms of original bailout.
Greece and Germany draw firm battle lines as eurozone finance crunch talks begin.
Greeks took to the streets as finance minister Yanis Varoufakis attended a meeting of his euro zone peers in Brussels.
The Greek government began negotiations with the head of the eurozone finance ministers in Athens.
This is make or break for Europe's populist parties. And Germany's leadership of Europe.