Venus is a Rajasic Graha/Planet, which deals with the finer things of life. Also, it is linked to love, marriage, money and the ability to enjoy life.
On the whole, like the moon, Venus is a soft planet, and it gets exalted in Pisces Zodiac – especially at the end of the sign in Revati Nakshatra
Taking this into account, let us try to answer the question
- The 8th House is a Dusthana House and brings obstacles. With the House representing Life post marriage, the presence of Venus does impact marital life in terms of personal equation or lack of marital bliss or lack of resources linked to making the marriage good. This will be true even when the 8th House is the Zodiac of Pisces
- This impact will be reduced if
- Venus is lord of the 6th or 12th House and sits in the 8th house, leading to Vipreet Rajyoga
- Venus is aspected or conjuncted by the 8th House Lord
- Jupiter is placed favorably concerning Venus
Hope this gives you an idea
On the whole, the placement is not good or bad, but has its limitations and positives under certain circumstances.
God Bless!
Lateral Thinking 
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