If you study muslim faith which is where djinn is most prominent. Djinn is the origin of angels and demons. They were not originally classified as holy and evil, but merely one class of higher being with extreme magickal influence over the physical world. So when summoning a djinn you don't know exactly what you're going to get, which is why it isn't very good to do. The wishes and vessels that "genie" were later connected with was an Arabian twist on djinn, and is nothing short of the christian concept of "making a deal with a devil" which is why so many genie stories end tragically.
So pass on summoning djinn, and maybe go for something like a positive elemental. But always have a good reason! Would you like to be asked to come to a place just because the person wanted to see if you would come? Any being would get peeved at that.