I can highly recommend pet rats, had them for years despite an initial phobia about their tails. They are hugely intelligent, (all of mine came to the call of their name), affectionate, (mine would sit on my lap or shoulder whilst watching tv or reading), love playing games with you and will set their body clocks to as and when you are up and about. Incredibly clean as well, spend a lot of time grooming and do not smell.
Mine were 'free range' and
would spend most of their time out of the cage, (watch wires!) but always went back in for their 'toilet'.
Only downside, short lived, think only one of mine made it past the age of 3. But a joy to come home to a living creature eager to see and engage with you. A home is not a home without a pet in my book no matter how good your social life is. Everyone needs someone or something to do 'nothing' with.