We had a great stay in this condo in Marathon Key. It was just as we expected all round. The pictures online are very accurate. The condo is well furnished and well equipped (there is more equipment in the kitchen than in the average rental condo, and there were a lot of beach towels provided too, which was great). The view over the water is just as we had hoped/expected (and the main reason we picked this condo). You can sit on the porch (which does have netting, anti-bug) and listen to the waves lapping away, which is just lovely. The sunrise was exquisite, and the sunset was also pretty. The beach outside is convenient for walking up and down and while the seaweed is a little smelly we were not deterred (and while we didn't do this, other people were fishing in boats or standing in the water). There is a closet with equipment for activities (eg snorkels, beach chairs, no yoga mats though, I used towels instead) and we rented the bikes/kayaks too for an additional fee (although did not end up using the kayaks). The pool in the condo complex is small but very warm.
This is a peaceful spot, but also a great location for a day trip to Key West and various other local attractions.. We enjoyed Island Fish and Herbie's for food (and shopped at Publix), and the turtle hospital was interesting too. There are some very nice beaches nearby as well (e.g. Sombrero, Bahia Honda). One of us was largely working during the trip and the WiFi at the condo was perfectly fine for that (including video calls).
The host was very communicative throughout our stay and answered all of our questions very promptly, including sorting out the bike/kayak rental that we had omitted to do before we arrived. There was a water main issue during our stay and she was very prompt about letting us know it was happening.
All in all we had a great trip. This is a very nice condo and totally lived up to our expectations based on the listing. We were very happy with our choice and our stay.