This place is PERFECT for a couple seeking time to explore the Seattle area. It is an ideal efficiency with everything anyone can need, with superior hosts and cleanliness. It is a short walk to wonderful restaurants and major attractions such as the space needle (1/2 mile) or Pikes Place Market (1/2 mile) or the ferry/waterfront (just 5 minutes more) all laid out nicely in the welcome book. It is also easy to get to public transportation (we walked less than 10 minutes to take the light rail to the airport for $3 a person for instance) so no need for a car. The welcome book also has easy explanations for using the heat, AC, washer/dryer unit, etc.
Your hosts, John and Lynn, are impeccable. Responsive, thoughtful, and generous. You won't go wrong here.
Just be aware that this flat is on the 3rd floor and there is no elevator.