I stayed at Silvia's apartment by myself for 4 nights and it was great! The check-in was no problem and I could reach her for questions even though it was late. The apartment is on the 6th floor but you can take the elevator. It's all very clean and has everything you need for the kitchen and the bathroom.
My favorite thing is the balcony and its view. I definitely recommend enjoying the sunset there!
The location is also convenient, you can easily walk to the Old Town, to the sea or central places like Aristotelous Square.