Mainly this chart reflects good compatibility between you two but things may be too "easy" and not stimlutaing enough. However, his stellium falls in your 5th so he probably triggers romantic feelings in you. Also, the Mars/Uranus conjunction shows that there may very well be sexual tension and since your Jupiter and Venus fall in their 8th house and your ASC in their 5th, it could very well lead to a romantic connection.It looks quite good to me but there's something that bothers me a bit and that's the fact that your Venus only widely conjuncts his Mercury (not a romantic aspect by itself) and that your Mars and Jupiter don't aspect his planets. So it *may* not be very fulfillin in the long run on a physical level for you.
Also, their Saturn doesn't aspect your planets so they may not be very serious about their commitment to you, and since both of you have Sun conjunct Neptune and it's a DW in synastry, you may confuse each other as to the situation of your relationship.
Maybe you should try to talk about it with them and see how they feel.
Good luck!