Had a great stay at Mark's. The room is exactly as described, clean and comfortable - perhaps a bit tiny (just like most rooms in Geneva :D) but totally fine for a short stay. Rest of the place is equally nice, clean, and very well heated - there are two big, beautiful and super-friendly cats, so something to keep in mind in case you're not a cat lover (I am, and became good friend with both). Area is super central, full of amenities and extremely well-connected to everything - that's a huge plus. Mark himself is a really friendly and sociable person, although I unfortunately managed to interact with him only twice during my stay (he was spending most of his days out, so I'd have had the whole place to myself to do some work etc. if needed). All in all, this is an excellent place (and very good value for money) for a short stay in central Geneva - totally recommended!