This was our first visit to Marocco, and we booked our first night at Riad L'Orchidée based on reviews that we found around the web. The room was excellent; very clean and tidy, and spacious enough for even a somewhat longer stay. The atmosphere in the Riad is very relaxing, almost Spa-like, and everything is well arranged. Warm water works, the bed is good, and the air conditioning heats the room well (we stayed in the Riad in February).
The Riad is located in a small ally close to the parking of Riad Larousse. The ally is lit at night, so we felt quite safe walking home at night to the Riad (it's a 15 minute walk from Jemaa el Fna). The Riad offers an Airport pickup (and dropoff) service for 15 euros, that we chose not to use because we wanted to find the Riad ourselves. This, however, proved to be impossible even with a map, so in the end we paid more than 15 euros for the taxi + someone who was 'helpful' enough to bring us to the Riad through the maze of the Medina - for quite a big sum of course. So, I would recommend anyone to use the airport pickup service, because it actually saves money.
The most positive aspect about the Riad is the politeness of the staff. We wanted to drive to the Sahara in a rental car, and return to the Riad afterwards. They organized the (good) rental car, booked the Riad for the day after our return, and even arranged a room at a nearby Riad for us for the days their own rooms were full. They also booked a Hammam for us, and were extremely friendly and service-oriented. When it turned out the other Riad would not provide a very early breakfast for us before our flight back, Riad L'Orchidée stepped in without complaint to serve us the breakfast at their Riad - even though we were not even staying there anymore.
So, in sum, I would recommend this Riad to anyone visiting Marrakech.