I would advise the Lord Balfor Hotel on South Beach
Location is just off south beach in the Art Deco area - its a 2 min walk to the main strip but somehow people stop at 5th st and never walk past so you get all the fun but no noise! Such a great area to spend some time and where you want to be. A little further up south beach is a great shopping area and some really great places to eat - especially in the Mexican area.
The hotel has its own 'reserved beach' area with free deck chairs and umbrellas (and towels) which is brilliant as it saves a lot of hassle.
Breakfast is great - if not a bit sparse to American Standards, but still very nice.
If you want to go to down-town Miami then its a cab ride (or the water taxi - lots of fun and you get to see a cool side of the city you wont otherwise see) which is not too much of an inconvenience to be fair.
https://www.tripadvisor.co.uk/Hotel_Rev ... orida.htmlSeriously, I would have a look at this place!
Dan