Congo's number one travellers' meeting point has clean and comfortable rooms (though try to avoid the smaller, noisier road-facing rooms). Overlanders are welcome to camp for free. The friendly French/Vietnamese owners maintain a really useful travellers' notebook full of tips for onward travel and the location is central and secure. Wi-fi is charged (500MB costs CFA5000).
Hotel Hippocampe
Top choice in Brazzaville