I have stayed at the Hotel Jena a few times over the last few years, and have always found it to be more than acceptable. The rooms are clean, the place is generally quiet, and it is conveniently located. It is quite close to Metro Hidlago, and within walking distance of Alemeda Park, the Monument to the Revolution, and the National Lottery Building (plus lots of other places). BTW, it is close to one of my favorite places to eat in all of Mexico City - Tacos al Caminero. As you leave the Hotel Jena, head towards the Monument to the Revolution. Walk to the Monument, and once you get there head to the left. You'll find Tacos al Caminero nearby. In any case, ask at the hotel if these directions don't make sense. BTW, most of the staff don't speak English too well, so a little Spanish helps. The restaurant at the Hotel Jena is ok, although better options are nearby, including the previously mentioned Tacos al C. and there is are VIPS and Sandborns quite near by as well. Prices at the Hotel Jena have been around 40-50 dollars (US) per night in recent years, which is higher than some of the smaller hotels nearby, but must less than some of the more popular places in that area (Hotel Melia, for example). I have never made reservations and they always seem to have a room for me, but they certainly will take reservations. All in all a very pleasant place in a convenient and interesting location.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC