Stayed here for 2 nights in a standard room booked via booking.com and from memory paid £85 per night for a standard room incl breakfast.
I arrived at 11pm tired, the reception area was very quiet, check-in took longer than expected but receptionist was friendly.
Room - I was allocated a room on the 2nd floor at the end of the corridor facing out on the main street the hotel is located on. Street noise from outside wasn't a problem but I was distrubed by noise from within the hotel on the stairwell next to my room, some clanging and banging nothing significant but since I'm NOT a light sleeper worth mentioning. Room itself was very large, had a small fridge and tea/coffee making facilities. Bed was comfortable and definately one of the better (ie softer) ones I had during a four week trip in Africa. Both the room and bathroom were very clean and everything worked well. Shower was over the bath with good water pressure and temperature.
Breakfast - Staff/service at breakfast very good. Selection was good eggs/omlettes cooked fresh, youghurts, cereals; weetabix, cornflakes, bran flakes & coco pops even porridge, Toast, pastries, cooked items which did change daily but from memory sausages, baked beans, bacon plus another few items. Only disappointment was there was a very limited fruit selection and although 2/3 juices to choose from no orange juice!
Concierge were helpful, I was a solo female traveller and wanted to go for a walk in the surrounding area during the day, they confirmed it was safe, marked a route for me and gave me some advice although I was already aware to avoid talking to people and watch my handbag etc.
Pool - Pictures on the website make the pool look bigger than it is but I spent a whole day relaxing by it and was able to get a very good wifi signal up there. It was very quiet with only a handful of people around and certainly allowed me to relax, sunloungers always available. Food & drink service from staff was good.
I also stayed at the Sarova Panafric and the Stanley is a more superior hotel, better location, bigger rooms and in my opinon better pool area, although breakfast at Panafric is better.
Overall I had an enjoyable stay and if ever in Nairobi again would definately try and stay at the Stanley.