My memory for this detail isn't the best but it is easy to Google any of the hotels to check them out.
Lake Duluti Serena Hotel - Arusha, Tanzania- ?? (probably not)
Ngorongoro Serena Safari Lodge - Ngorongoro Crater, Tanzania - their website says, "Bathrobe and slippers"
Four Seasons Safari Lodge Serengeti - Serengeti National Park, Tanzania- yes
Amboseli Serena Safari Lodge - Amboseli National Park, Kenya- their website says, "Bathrobe and slippers"
Fairmont Mt. Kenya Safari Club - Nanyuki, Kenya- yes, their website says, "Fairmont bathrobes and slippers"
Fairmont Mara Safari Club - Masai Mara National Reserve, Kenya- ???
Nairobi Serena Hotel - Nairobi, Kenya (day room unless you booked an extra day)- yes, at least there is one in a photo of a room.
According to the Lake Duluti Hotel website robes and slippers are provided in the room . All the other hotels also provide robes and slippers per their websites.
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Lake Duluti Serena Hotel - Arusha, Tanzania- ?? (probably not)
Ngorongoro Serena Safari Lodge - Ngorongoro Crater, Tanzania - their website says, "Bathrobe and slippers"
Four Seasons Safari Lodge Serengeti - Serengeti National Park, Tanzania- yes
Amboseli Serena Safari Lodge - Amboseli National Park, Kenya- their website says, "Bathrobe and slippers"
Fairmont Mt. Kenya Safari Club - Nanyuki, Kenya- yes, their website says, "Fairmont bathrobes and slippers"
Fairmont Mara Safari Club - Masai Mara National Reserve, Kenya- ???
Nairobi Serena Hotel - Nairobi, Kenya (day room unless you booked an extra day)- yes, at least there is one in a photo of a room.