I found this B&B online, by chance – and what a stroke of luck! It is comprised of five large guest rooms in a beautiful old townhouse in a charming residential area to the south of the city centre. (Right on a tramline, it's a 15-20 minute ride to Central Station.) I'd originally booked for one night, but when I saw my room (Nº2) I immediately extended my stay to three nights. Room Nº2 is on the second floor, with three double French doors overlooking the tree-lined Amerikalei street. With ceilings approximately 4-metres high, light floods into the room during the day – at night, heavy black velvet drapes make it cosy and perfect for sleeping. The original, ornate ceiling mouldings have been beautifully restored; an enormous, freestanding bathtub sits in the middle of the room – taking a bath with the windows open is magic. The king (I think?) sized bed is incredibly comfortable, the sheets high-quality, bedside lamps and wall sconces as well as a shaded overhead light (all independently operable) make for a very pleasant atmosphere. There is limited closet space and no refrigerator in the room, but these are very minor inconveniences given the overall ambiance of the room.
The proprietor, Sharon, is not on-site at all times but drops in regularly – and responds rapidly to emails. She knows the area well, has great suggestions for local restaurants, cafés and bars – of which there are many on several picturesque plazas 10 mins walk away.
Super highly recommended!