My wife and I stayed here for 2 weeks in June / July 2014. Elsa (the owner) and her staff were so helpful and accommodating. We had a lovely 3-course dinner, when we arrived, which was about 10 in the evening.
She guided us to Place Djamaa el Fna and showed us where the banks were, for cash. All the ladies who helped her were polite and considerate. They also have their favoured taxi company, who provide first-rate services.
The location is ideal - just a short walk from the Place, but far enough out to be quiet and restful.
We don't normally revisit hotels, wanting to move on and experience more, but Riad Wo will be the exception.
One word of advice - Ramadan lasts a month, and whilst it does not directly affect tourists, the life in the city changes significantly. It goes to sleep in the morning, wakes up in the afternoon, then goes very quiet again at 8 o'clock, when everyone goes home to break fast. It's not better, or worse, than before Ramadan - just very different.