My first time back in Hannover in 37 years, my mother is from here and I spent many summers in Letter, a village nearby. Room size was fine but there was no a/c and I like open windows 'cos it was warm. However be warned the Vahrenwalder is on a 6 lane main road into the city and the tram runs down the middle. Consequently there was traffic noise 24/7! Fine during the day but I used to turn up the TV to try and cover it, all to no avail.
Aside from that the breakfast was good, plenty of choice plus hot food, which you don't get in many budget hotels.
When I return to Hannover I'll look for somewhere in a quieter location but apart from that I'd recommend it as the tram is outside and 10/15 mins. from the centre.

I booked it for the Cebit exhibition meant that prices were increased by 5 times the original rate.
I requested a non smoking room however this was not granted so I had to pay an additional 20 euro (on top of my inflated rate) to get a non smoking room
The room was extremely clean and spacious however I had to sleep with ear plugs as I was facing the busy street.
Tram stop convenient into central Hannover (9 mins)
Breakfast was good. Staff couldn’t recommend any restaurants (non in the area besides Burger King and Greek restaurant and Thai further down the road)
Free internet was s-l-o-w
Not bad as a budget hotel, but can’t help but feel ripped off that I had to pay additional 20 Euro.

I stayed at this hotel for 3 nights. The büttnerstrasse tramstop is nearly on their doorstep! I had an economy room which means that you stay in the motel behind the hotel. Yes, the room is basic. But it was clean during my stay. And there is a free internet connection altough the connection might be slow sometimes. The television has many channels, there is also CNN and BBC World. The breakfast is very good and it is served in the main building. I also noticed that the staff in hotel is friendly and helpful. The vahrenwalder strasse is a long street with many shops and restaurants. There is Burger King nearby, and there is a Pennymarkt supermarket opposite the hotel. Altough the huge Marktkauf at the niedersachsenring tramstop is a better option if you are looking for a supermarket. It's one stop from the hotel but you can easily walk the distance. It was my second stay in this hotel and I would return when in Hannover again.