I've been to Vegas many times, and I've never had a bad experience at any of the places I stayed.(Bellagio, Caesars, MGM Grand, Mandalay Bay, Flamingo).
However, I am going to reccommend you check out the place I stayed the last time I was in Vegas: Vdara.
It's located right in-between(walking distance) Bellagio and Aria, the two best resorts on the strip, IMO.
Vdara is unique because it does not have a casino. Its a true quiet escape just seconds away from the hustle and bustle of the strip.
I had a Vdara Suite,which was by far the nicest room I ever stayed in while in Vegas, but the regular rooms are reasonably priced for what you get.
https://www.vdara.com/en.html
Like I said before, I think you will have a good time wherever you stay, but for someone going to Vegas for the first time, I would reccommend one of the casinos that is centrally located on the strip, making it easier to get everywhere, because there is a lot to see