Hello mtatum
I would rate HSH as down-to-earth: for a start, there was NO reason to approach the group I was in and start talking to us - I had no 'official role' in the proceedings, I was just at Chelsea because I had an invitation to the first day. Since we only exchanged a few sentences, bascially with me replying to his questions, rather than 'leading' the conversation myself, I suppose the honest answer is that I am (theoretically) not really in a position to give you a comprehensive answer, but my gut feeling is that Albert is sincere and well-meaning. For a start, I think back to my first, and indeed only real meeting with Princess Margaret, whom I found bored and tetchy [I was attending an official engagement and therefore I thought that PM should have been more gracious - to put it bluntly, attendance at royal engagements is your 'job']. Compared to Princess Margaret therefore, I found Albert polite and interested.
Chelsea Flower Show is of course a rather 'informal' occasion, and the atmosphere is therefore geared to light remarks about horticultural rather than conversation at a State Banquet would be!, and so I suppose 'light conversation with people looking at the Garden' in the way Prince Albert engaged with us was very much the 'order of the day'
I got the impression that Prince Albert 'works hard' to promote Monaco; in one sense I suppose he has to, because the Principality depends on both tourism and the creation of a 'stable' atmosphere conducive to promoting busiess for its revenue. Without trying to read too much into the short conversational exchange I [and several others] had with him, I think it would be accurate to say that he seemed 'mildly anxious' that we were all enjoying the garden.
In my very humble opinion, I think that Prince Albert is more or less like you see in photos - I rate him pleasant-looking rather than handsome. Again in my very humble opinion, of Prince Rainier's 3 children, I always thought that Princess Caroline and then Princess Stephanie[in that order] were 'better looking' than their brother. This is only a personal opinion though.
Hope some of this helps
Alex