We stayed here for a conference at the MuCEM for about a week. The location is great, close to the subway, shops and attractions. The property requires a digital key to get in and it felt safe. Our room has a partial view of the harbor and nice view to the Notre-Dame, they lights up at night which is very beautiful. Kitchen is very nice and we had breakfast and dinner at home. Beds are comfortable, bit small though (french size). Heating is strong so we did light washing. We truly felt we have a place to "stay" in Marseille.
The only nuisance is, during late night, there were shouting talking, car noises and horning on the streets. Well, one may not be surprised cause this is Marsellie.