After staying at Flisvos Laguna House, I'm quite confused about the reviews I read before booking.
I do agree with those saying that the patio is nice, and the interior of the studio as well. The studio, which is quite tiny (absolute maximum 2 people I would say) has a well equipped kitchen which is suitable if you want to cook at home.
The location, however, is not at all what I expected it to be. What is being described as "close to the center, but a countryside vibe" is actually a house in a quite dodgy area a good 30+ minutes walk from the center of the city. The "well lit up country road" from the house, is a dirt road with a few lights from a single hotel nearby. I'm sorry to say, if I was a solo traveller, I would not have felt safe walking to and from the place.
I really really wanted to give a better review, but honestly, unless you're in Naxos for watersports at the laguna, I would look for another place to stay.