Merhaba, I’ve been reading your posts and questions and would like to give some advice:
Do not buy an apartment without seeing it first. Like in the US, the real estate ads only show the best features. The price of apartments you mentioned are (by my experience) in a lower working class neighborhood. This isn’t bad in itself, but the building could be poorly build/maintained due to lack of funds by the owners. I’d rent first, then get to know the area you like. Once you buy you are on the hook for all building expenses shared by all tenants including repairs and improvements agreed upon before you bought. My apartment in Izmir is in a working class neighborhood and I’m very happy there. Remember, look before you leap.
The noise issue; I must admit I’ve never had an issue with noise from the neighbors in all 7 apartments I’ve lived in and I’ve never lived on the top floor. The noise you will have is street noise: i.e., cars/trucks/buses honking their horns, scooters without mufflers, street dogs, etc., for me it all became background noise in a couple of months. Blocks of high rise apartments act like canyon walls and the noise echoes back and forth.
Don’t expect people to speak and understand English. In tourist areas, it’s not an issue. In most working class neighborhoods it may be hard to find an English speaker. My closest friends don’t speak a word of English. The forms you sign in Turkey will be in Turkish, do not sign unless you have a trusted agent/friend tell you what is in it. Once signed it’s legally binding.
Electricity; as Ken said the plugs are European and the voltage is 220. Also the frequency is 50 Hz, we use 60 Hz in the US. A transformer will not change this, only the voltage. Your cell phone/tablet/laptop power supplies should work in Turkey with an adapter, but check the small print on them to ensure they work in 50/60 Hz; if not they will slowly overheat and stop working prematurely.
Lastly, you stated you don’t like getting ripped off. Well, to most Turks you are a rich American compared to them. Unless the price is marked on the product, it will tend to be higher for you in my experience. My wife of almost 40 years is Turkish, when we go shopping, she will almost always go back and buy the item without me being there as the price will be lower.
Learn to bargain, don’t be in a hurry, drink the tea offered, be friendly and you will do well.