I'm afraid I can't tell you much about Franz Loffler, except that he's German and a guitarist. He appears to have a jazz background and his recordings, most of them for Polydor in the late 1960s and into the 70s, fall into two categories -- jazzy interpretations of the classics, like Swingin' Bach Guitar and Swinging Baroque Guitar, and easy listening, such as the second volume of Gitarre in Gold, released in 1969. (The first volume, which came out in '66, featured another German guitarist, Karlheinz Kastel).
Fans of studio players like Al Caiola and Tony Mottola will probably dig what Loffler has to offer.
Azzuro is an Italian pop song made famous in 1968 in a recording by Adriano Celentano. There were several German cover versions, including ones by Peter Rubin and Peter Alexander. Loffler included his interpretation on Gitarre in Gold 2. It's available below.
Both volumes of Gitarre in Gold were also released by Polydor in Canada but I'm not sure whether that happened in the U.S. It seems unlikely. These recordings have never been released on CD and aren't available as downloads.
However, there a few other Franz Loffler offerings available from iTunes and perhaps elsewhere as well.
From YouTube, here's Loffler doing the Latin standard Brazil.