I went with my sister to Copenhagen, just for a weekend. When you haven't got a lot of time and you haven't made too many plans, the best way to see a city is by foot or bike. That way you can glide around the streets getting to know the city's layout and you'll stumble across things you didn't plan to see but are very glad that you did.
Copenhagen is a wonderful city where everything functions well. Our experience of hiring city bikes was therefore unsurprisingly fuss-free and smooth. Even though it was December, the weather was as mild as in the UK at that time of year so we cycled to our destination (the 'free-city', Christiainia) without getting cold hands and faces.
You go to the docking station, select a bike, and use a credit or debit card to create an account. You do this using the system attached to the bike's handlebars, there is no separate kiosk. Once your account is created, the bike will be released. It's a very simple process and the option of having all the information displayed in English means that you can't go wrong.
If you're just visiting the city, you will select the pay-as-you-go option, which is DKK 25 / hour (approx. £2.50). The first trip we made lasted 34 minutes, but we were charged for the hour. The account you created when selecting your bike links to your bank account and the money is withdrawn direct. When you first set up an account and register your card information, a deposit of DKK 200 is held, and is released back into your account after two days. If you're living in Copenhagen and you use the bikes for commuting, you can set up a monthly subscription, which costs DKK 70 / month where the first half hour is free and after that it costs DKK 6/hour.
The screen that was used to set up your account also serves as a navigation system with a map to guide your route, as well as a guide to where the nearest docking stations are. There didn't seem to be that many around, but they did appear to be placed in the key places, such as the train station, so these would serve as useful reference points which you can then easily walk from to your destination.
Creating an account is very easy and the built-in navigation system is helpful, especially the feature that tells you where you can find the docking stations. The bikes ride smoothly and are easy to pedal. The single speed is set to a low-ish gear, so starting off can be a bit clumsy, but once you get going you can pick up a lot of speed. There is a built-in battery that provides assistance for 25-45 km if fully charged, as well as a 250 watt electric motor. The seats are comfortable and adjustable.
The bikes are quite heavy and not the easiest things to manoeuvre. Therefore if you aren't too sure where you are going and need to stop to get your bearings, or you are exploring the city and would like to relatively easily hop on and off, it takes a bit of getting used to.
Very positive. The city welcomes bikes, with its wide roads and cycle lanes. There's a lot of space and I didn't once feel pushed towards the curb by a bus towering above me, like is so often the case in a less cycle-friendly city such as London. I did get slightly confused with having to cycle on the opposite side of the road to the UK, but that's something you would soon get used to. Especially if you spent longer than a weekend in the city.