We stayed here for three nights. It was well located for a 15 minute walk into Vieux Port and right by the bus stop for Cassis. The room was well furnished and has character (i.e. not particularly modern but nor does it pretend to be and that is part of its charm). The room was nice and spacious with room to spread out.
Romain was helpful introducing us to the room and with his tips for the area, although his arrangements for letting guests into the flat for the first time was a little haphazard. Romain does not take credit cards and if you pay by Paypal in advance for the upfront payment when booking he will charge you the Paypal cost of transfer so best to pay by bank transfer to avoid having to bear that cost.