Others here on the board may know more than I about this, but I will let you know my experiences. Standard view rooms will typically get you a view of trees or a parking lot, these rooms can be on high or low floors depending on the building and which side of the building. Deluxe view rooms most often have a view of the pool and are on the middle floors of the three buildings. Premium view rooms can have a view of the pool or DTD and will be on the higher floors. You can request things, but since view rooms are typically charged more than a standard room, and are a booking category, it will probably take some Disney magic to get one of those if you booked a Standard view. Also some rooms do not have a day bed. I am guessing some of the two queen rooms in the Fantasy tower do not have day beds because I am pretty sure those rooms appear to be slightly smaller (not as wide) than rooms in Adventure or Frontier Towers.
We were at DLH earlier this month with room booked with a Premium view. I had requested a room with a view of DTD with a daybed. When I checked in we wrere assigned to a room with neither of those. When I saw the room number I could tell it was in the fantasy tower which I confirmed with the CM, so I asked if the room had a daybed. It didn't. The cast member told me I had to pick what was more important to me, either DTD view or daybed, so we picked daybed. Our experience with this CM was less than "magical" but that's another story. Anyway she called the room assigner and they re-assigned us to an awesome room on the 11th floor in the Frontier tower with a view of parts of DTD,
Disneyland, and the Pool as well. We found we loved that tower, personally, and lucked out to get one of the limited parking spaces next to Frontier so we had a very short walk from car to hotel elevators.
I would request what is most important to you. You can get Standard rooms in the Adventure Tower, but they will probably be on the floors 2-4 with a view of trees and landscaping. There are Standard view rooms in Fantasy tower on the parking lot side of building which do have a side view of Disneyland and can see the fireworks. Standard view rooms in Fantasy can be low or high. Make sure when you check in to ask again for your preferences. They should at least be able to get you a Daybed room and maybe you are lucky they will get the view you're asking for too, if they can.