@Pamela1060 You can see the ratings each guest gave you by going to your reservations page and clicking on "Details" next to each guest's name. (At least I think that's where I found it).
Do not concern yourself at all with the location or value ratings. They are totally fickle and there is nothing you can do to improve them, aside from making sure you have described your location clearly.
Guests will give low location ratings because they "wished" it was closer to the beach, or downtown, or wherever, even though they booked, knowing that it wasn't near the beach, or downtown. And other nonsensical reasons. Same with value- if it wasn't free, it was too expensive. However, if you get consistently low value ratings, make sure your pricing is reasonable for your area and what you offer.
There's no use asking guests about those ratings, as their answers would be largely absurd.
However, if you were getting low accuracy ratings, for instance, that would be worth asking about. Sometimes hosts think they have made everything clear in their listing info, but it might not be clear to guests and may need tweaking.