These concerns are often seen with wood built buildings...but you can also get them in more economically priced apartment style condos. The type of flooring might dictate what can be done to improve the situation. Vinyl is tough to get these things under control. Laminate and hardwood are easier to deal with because you can get some high-quality, 1/2" or even 1" cork underneath to help. A drop down acoustic ceiling will certainly reduce noise from above...but it won't do anything with noise traveling from one area of your condo to another. Another place to add some bulk = solid core doors. They will greatly improve the noise reduction from one area to another. And carpets reduce the noise transmission from one area of your condo to another.

If you like the current color I recommend adding to it and using an flush divider, which we generally call a header. One advantage of this (besides costing less, being less disruptive and causing less consequential damages) is that in the future the kitchen could be recoated up to the header. Your kitchen will get several times more wear than most areas of the house and will require recoating more frequently. It's often a challenge finding a place to stop the coat that doesn't show a stop-line, meaning that we often have to recoat more area than necessary. If you were more interested in making it perfect rather than acceptable, I would recommend paying the floor guy for the wood he bought, wait until you're ready for a kitchen renovation, lace the wood in at that time and refinish everything. They may not be willing to store the wood so you might need to find a conditioned space to store it. This strategy would also protect you if something on the new kitchen varies slightly from the existing.

Overnight drying doesn't guarantee drying. With the combination of high humidity and low temperature, the dry time will be extended. I ran into this issue back at the end of September. Daytime temp was still high (mid-70's) with nighttime temps low (50's), then add in high humidity (65%). Perfect scenario for adhesion failure. I had to redo the project, but this time had the thermostat on heat with temps set at 72 degrees to correct the problem. The white spots here looks like the finish is flaking, which indicates adhesion failure. The darker blotch looks like they applied stain as a touch up. This can be a high spot on the floor. Where the buffer removed the finish and stain in the process of screening. The contractor decided to touch it up. It may also be a a water mark. If, the contractor did not water pop the floors. This can be the result of a spill. It's just odd that it is three areas?

In building law (check your state/province for confirmation) the contractor's are normally allowed ONE attempt to fix their mistakes. After that, if the issues persist or are made worse, the contractor (that's you) has the right to find another professional come in and fix the issue - paid for by the original company. The 'paid for by the original company' is the tricky part. That's where things get messy. It is normally a LOT easier to negotiate a discount. With the money you save you can have another company come in and redo the process. I will tell you that another company will really really want to start over...so be aware of that. You are also welcome to negotiate the discount and then leave the floors alone. Sigh. I know. This is not what you want to hear but it is an option. You can decide which is more important to you: perfect looking floors regardless of the cost (financial/emotional/physical) on you and your family vs. money in your pocket and a fully functional floor ready to be lived on. You have sanding issues which will NOT come out without a full sand/refinish. You have stain issues that will not be corrected unless you do a full sand and refinish. You have gloss levels that are unequal which CAN be dealt with with a buff and coat. So...as homeowner you have two choices to make: 1. How much is the discount going to be (you do NOT have to let them back onto your floor) 2. How much do you PRIZE a perfect floor over your family's comfort? Either way, negotiate the discount and free the company from further obligations to you.