This is not a strong aspect, but it both are positive.
Venus trine Ascendant means that his social mask behaviors (Ascendant) bring out her affection (Venus).
Venus trine Mars means there is a minor "spark" between them . .emotions and sexual.
Her Moon conjunct his Sun is a very strong attraction. A basic compatibility between her unconscious nature and his conscious nature. And between how she is emotionally and how he tries to express his self-esteem. They naturally support each other.
But unless on of them has their Sun or Moon or Venus or Mars in a conjunct or opposition aspect, either there will be no significant relationship between them, or it will not last for more than a few years. As soon as the fantasy stage ends and the problems (the negative synastry aspects) start to come into play the relationship starts to fall apart.
You need that kind of Ascendant contact IF they two will be motivate to stick it out for the 20 years it takes to figure out how to get along and master the challenges of the squares and oppositions in the synastry.
The conjunction of her Moon to his Sun is very helpful, but is not in itself enough to motivate them to stick it out long enough.
For example, Mikhail Baryshnikov had that Sun-Moon thing with Jessica Lange. They were madly in love for a while and even had a child, but broke up after about 4 years.