Should i be suspicious?

[bushido_man96]

yes, I would do a light to medium spar with him to see how he reacts and if he knows how to defend himself.You just want to get an idea if he has anything.Again you have to ask in the right way don't challenge him.

But if you have no prior experience, you could still be snowed over pretty easily.

[NightOwl]

My experience with a garage master was great. It was casual (no belts, just moving on to new things when he thought you were ready, and a close atmosphere), authentic (he had the lineage), and he taught things hands on with plenty of application work. People teaching out of their home means that they don't teach for a living- but rather a love of the art that they do. Of course it still might not be a good school (you should always check a place out), but the fact that it isn't in a fancy dojo is nothing to worry about in of itself.