Aquarius as well as Libra is a socialite. The Scales will be intrigued by the Water Bearer's intellect and Aquarius will find a great conversation partner in Libra. The two will never demand too much from each other, and thus both will still keep their so-loved independence. The only serious challenge that might come up is to get Aquarius's commitment, which Libra at some point will want. However if the time is right and Aquarius is serious about the relationship it's completely possible. Libra will also find it difficult to change Aquarius, since Water Bearers are usually strong headed, so there has to be a little adjustments on both sides. All in all the compatibility is great, except for few minor bumps.
