There are some sentences in your paragraph that lead me to believe this was potentially a third party booking. You say he was looking for a room for his daughter, and you wanted to "See if he was looking for a place just for his daughter or will his wife and him also be staying that long." Third party booking are not allowed through Airbnb, and can be troublesome if you do decide to go against this rule.
That being said, allowing potential guest into your home prior to booking could be a negative. I understand the request to want to see a place you plan to stay long term at, but as others said, it could also be a ruse, and turn into a dangerous situation. I have only every let one guest see my home beforehand, and it was because he was hired at my place of employment, and I was able to verify this before he viewed the home. Always be careful about allowing people into your home, especially those with negative reviews.
A guest should be upfront about the number of people he/she will be bringing so you can plan and charge accordingly. Would you be comfortable with a third person arriving at some point? Are you able to accommodate that?
Lastly, every so often an otherwise good guest gets a bad reviews. Maybe the host and them were not a good fit, or maybe it was an isolated bad stay. At times I have overlooked a bad review if a lot of good ones overshadow it. However, a guest that got confrontational, would be a red flag for me. Being a little messy is one thing, being angry and/or intimidating is another. Be careful with allowing guest like this to book, as it could very well happen again.
If I were you, I wouldn't accept the request. The bad review, lack of boundaries or manners (Just walking in) and unclear information as far as who is staying is a recipe for a bad stay.