The host, Mr. Attia, is superb.
He is trustworthy, decent, honest, considerate and well educated, working as a civil engineer for the government.
The room is pleasent to be in; in the winter and early spring it tends towards being cold, but I suspect by this in the summer it is ideal. Note that I more than anyone else I know feel the cold, so your experience may well differ.
The bed is good, but for me (82kg) on the hard side.
The shower is good, an unlimited strong hot flow of water, but makes the floor around it somewhat wet. I've left a water-mop for the next tenant.
There is a fridge and a freezer, both work well. There is a desk, chair and lamp, which I used comfortably enough for work during my time there.
The cooker is a kitchen-top unit, two-hob and electric. This is an intentional choice by Mr. Attia, due to the potential risk of gas leak.
Tunis is a city of two halves, the inland and working class half is the "Bardo", where this room is, and the coastal and upper class half is "La Marsa". The Bardo is the real core of the city, where the everyday people live, where the Medina is found. If you want to see real Tunis, this is where you go. La Marsa is upperclass, has better supermarkets and gyms, is cleaner, more like living in a Western city.
Getting into the city center requires a tram ride. Be aware that the tram service is infrequent by Western standards; perhaps one every twenty minutes. During the rush hour, the tram is absolutely packed, so much so that it is physically impossible to board. At this time also all the taxis are occupied; you simply have to walk, or wait for the rush hour to pass.
There is a small, fairly poorly equipped (there is only one changing room, which alternates between genders) but clean and friendly gym two tram stops westwards. Almost all gyms (I visited six) have showers which are not clean; you wouldn't want to go in them. Be aware male nudity in the changing room is a no-no.
Moving on to the negatives, there are two issues with the room.
Firstly and entirely ouside of Mr. Attia's control, one of the neighouring houses has a dog which often barks for hours on end, all night long even, triggered by the smallest of noises. You do get used to it, but it takes a week or two. Bring ear-plugs.
Secondly, the nearest supermarket is across a four lane dual carriageway. It is customary in Tunis simply to walk (carefully) across busy roads. The drivers are used to it - but all the same, especially durng the busier hours, this is not fun.
All in all, certainly recommended, particularly so given there is a certain culture in Tunis of defrauding tourists; it's good to be certain you're with a fully reliable and trustworthy host.