Noise is purely relative. Hens are not nearly as noisy as a crowing rooster but occasionally they can be loud, like after they lay an egg. If you are trying to keep your chickens a secret from your neighbors, they will hear the hens, but that is pretty much during the day and is not rally all that annoying. How much noise a hen makes does vary by the individual and what is annoying to your neighbors depends on the neighbor.
You can manage the smell. If you keep the coop and run dry, you will not have much smell at all. If it gets wet or the poop builds up to where it stays damp on its own, yes you can get strong smells. First and foremost, keep your coop and run dry. Don't let any rain water or water runoff in your run. Cover your run. Divert runoff away. Build the floor of your run up high enough or lo0cate it on higher ground so water cannot run in. Pat's article on Muddy Run may give you some good ideas. By the way, read all of Pat's articles. They are good.
Muddy Run
https://www.backyardchickens.com/web/viewblog.php?id=1642-fix-a-muddy-run
Pats Winter Coop Temperatures
https://www.backyardchickens.com/web/viewblog.php?id=1642-winter-coop-temperatures
Pats Ventilation
https://www.backyardchickens.com/web/viewblog.php?id=1642-VENTILATION
Another good way to keep the smell down and make the litter in your coop last longer is to use a droppings board. Chickens poop a lot when they roost. If you put a surface under the roost to catch this poop and regularly remove it before it starts to smell, you help yourself a lot. Many people scrape the droppings board daily. I can wait for 4 to 6 days to clean mine, depending on how wet and humid it is, but my circumstances are different from yours.
You will need a poop management plan. What are you going to do with the poop and bedding you take from your elevated coop? It makes great compost and if you control the composting dampness, it will not smell. If it gets sopping wet, yes, you can have a problem.
You mentioned you are planning to get two EE's. Might I suggest three instead? Chickens are social animals. They need other chickens around or they get extremely stressed. Things happen. If you start with two, you may wind up with only one.
Lets discuss space a bit. The general rule of thumb on here is a minimum of 4 square feet per chicken the coop and 10 square feet per chicken in the run. The area in the run is pretty valid in your case and if they can get under the coop, the area under the coop still counts. This area not only helps in the poop management, but it helps keep them happy and content so they are not trying to kill each other. They will do that if they are too crowded. A 4 x 8 run might be something to consider. It is a good size for three chickens and a great size for two chickens. The more space, the better. And since most building materials come in standard 4 or 8 increments, it is a pretty efficient size to build. Just watch centerline or out to out dimensions when you are planning it so you remain efficient with the building materials.
The 4 square feet per chicken may not mean a lot in your case. There are a lot of things that go into that number. It takes into consideration poop load a coop can manage based on standard management practices. It assumes that you have to leave them locked in there for several days at a time, usually due to winter weather but there can be other reasons. It assumes you have enough chickens for averages to matter. I dont think you will. If you feed and water in your coop, you need room for the nest box (one is enough for you), for a roost (minimum 8 per chicken. A bit more is better in your case. It is not just the room they need to roost, but they need some room to get up there with their wings spread) and room for the feeder and waterer where they will not be pooping in it while roosting. That can be hard to squeeze into 4 square feet per chicken hen you only have a very few chickens. If you feed and water in your run instead of in the coop, that frees up a lot of space. Your climate and how you manage them will have a lot to do with how much room you actually need in the coop portion.
Hope this helps.