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All property transactions in Germany must be done by an independent public notary. This makes them very safe, as long as you follow the guidelines, have a good look at the property in question and do not send any money before the public notary instructs you to do so.
Thus the risk of using this dubious company is just that you waste some time until you find out they are bogus.
But do keep in mind this general piece of wisdom: If something appears to good to be true, it probably is!

As Beppi mentioned, a property transfer has to go through a notary. This should guarantee that the property actually exist and belongs to the people who claim to own it. It doesn't give any guarantee about the  condition of the property or the neighborhood or many other factors that might make the property undesirable. And a shady notary working in connection with a shady realty business is also not unheard of.

I was wondering if you eventually did find out any more about Stimul Consulting  since I've recently been in communication with them about their services myself. Some of Stimuls  property deals  look just to good to be true, so like you were, I'm a bit worried there might be something dubious going on.  As it's now several years on from your initial post it'd be great if you could share any experience you may have had if you eventually did use them, or anything else at all you may have eventually found out ?      Thanks

NickJM wrote:

I was wondering if you eventually did find out any more about Stimul Consulting  since I've recently been in communication with them about their services myself. Some of Stimels  property deals  look just to good to be true, so like you were, I'm a bit worried there might be something dubious going on.  As it's now several years on from your initial post it'd be great if you could share any experience you may have had if you eventually did use them, or anything else at all you may have eventually found out ?      Thanks

The OP has not been active for 3 years, so it's very doubtful you will get a response.

The company Stimul Group only has a Russian language website, despite dealing with property in Germany. That alone should tell you that you are not among their intended clients (unless you are Russian, of course).
It is typical that many Russians in Germany live in a parallel world to ours, which is dominated by dubious dealings (by rich and well-connected Oligarchs), money laundering and their own version of the Mafia. Not something I want to get involved in!