Thanks JP, it's always good to learn know more PCB companies such as ASILER which could benefit also customers within EU.
I checked their web page and found a few discrepancies, if this is a German company they generally have an "impressum" somewhere on their web page, from Wikipedia.
An Impressum (from Latin impressum, "the impressed, engraved, pressed in, impression") is the term given to a legally mandated statement of the ownership and authorship of a document, which must be included in books, newspapers, magazines[1] and websites[2] published in Germany and certain other German-speaking countries, such as Austria and Switzerland.
Secondly I see the company is registered as "
AISLER B.V.", normally its Dutch or Belgian companies that uses B.V. (= Besloten Vennootschap).
I found this article regarding AISLER PCB's, the costumer had to wait nearly 2 weeks before "manufacturing started" which sounds like a cover up for shipping from perhaps somewhere far away may be a hint the PCB's are not made in Germany.
Boards from Aisler | Details | Hackaday.io
The article was published in October 2017 so things may have changed since then.
With regards to quality, a quick glance shows the white legend print, ie. silkscreen, on their boards is not sharp enough, also there seem to be some minor discrepancies with pad/trace size and shape, compare with OSHpark and SeeedStudio, see attached pictures (click in lower left corner to magnify the pictures for better quality):
Green PCB = AISLER
Purple PCB = OSHpark
Red PCB = SeeedStudio