Would go back
This was our first trip to Key West, and we are very happy we stayed at Crowne Plaza. Our room was pretty but on the small side. Beautiful lobby, personnel all helpful and polite, excellent restaurant/bar on site.
The biggest plus is the location on Duval Street, especially if you love to walk and gawk and party.
We had no problems with WiFi connection, pests, noise, what-have-you.
This is not a resort hotel. If you want that type of atmosphere, this is not the place.
The main drawback was we could not open the windows (our room on the 5th floor faced Duval Street, and I am somewhat claustrophobic). We were there during the winter season, so the lodging was fairly expensive, so be prepared.
In summary, location, location, location!