We stayed in this hotel for 3 days - it was a very good experience. The staff is extremely helpful and polite - somebody from the reception helped us to book the hotel for our trip next location. Even if there are some train tracks on the other side of the road, the rooms are pretty well isolated and this was not an issue. The subway station is close, so it's an area with restaurants. The room is clean with a decent size and has free Internet access(we borowed an Internet cable from the reception), fridge, TV, hair dryer, flat screen TV.

This was our second stay here at the Annex. They have done some of the rooms up since last year (we were on the 7th floor and it was definitely new).
The location is brilliant - if you have a JR pass especially so - you are across the street from Shimbashi station and you can use the Yamanote line for free inside tokyo with your pass to get pretty much everywhere you need to go (Akihabara, Shinjuku, Shibuya, etc).
There are loads of small restaurants within 2 - 5 minutes walking and of course you have all that Ginza has to offer shopping wise.
Bic Camera is right down the street too. What's not to love?

They have a new underground passage to Shimbashi station, which is nice if it is raining. There is also a new German (?!?!) restaurant located downstairs next door if you need a quick beer and a bratwurst! We've never managed to make it to the Italian restaurant on the premises - the hours are not good - but there is plenty of great stuff on offer all around.

The only downside is not specific to the Annex - the lack of ability to control the room temperature. The japanese like their rooms HOT!

We'll be back on our next trip in September, so I think that says it all.

We enjoyed our three day stay here as it was very comfortable , clean and the staff were extremely helpful. The hotel is in a convenient location within about 7 minutes walk from the metro. If you are on a budget this is an ideal place to be. [Going to the loo in your hotel room is certainly an interesting experience, I laughed like a drain every time I went! Some loos will even play you a tune.] Tokyo is a mixture of ugly futuristic buildings and beautiful historic shrines. It is an interesting place, but I would not want a second visit. Unless you are wealthy, don't eat in the restaurants they are VERY expensive. It is possible to find little back street 'noodle houses' and eat for about £12 each.

This hotel is excellent in terms of value for the money. I had a recently refurbished room on 9th floor. The room was on the small side but absolutely adequate, the most clean one we had in Japan and nothing to complain about. There is enough space for the luggage of two persons. The bed was very comfortable and I loved the pillows -one memory foam and the other feather. We could never hear any noise from other rooms during the 7-day stay. And the massage chair was extra bonus. The best thing was definitely the wonderful view you can enjoy sitting on the large window sill.