Language in Marrakech: Arabic and French (as well as Berber) are the most common languages, however you'll find English is also widely spoken.
Currency in Marrakech: Morocco used the Moroccan dirham, which at time of writing is 12.75 Dirham to the Pound. It's a closed currency, so take cash and change it when you arrive, or use a local ATM. You'll need it if you want to shop the souks or use taxis - we found we heavily relied on cash on our most recent trip.
When to Visit Marrakech: March to May and September to November tend to be the most popular times to visit Marrakech, when the weather is most temperate. However high season also means more crowds and increased hotel rates. Winters are mild so a good alternative if you want to skip the crowds, although it may be cold in the evenings, and sun isn't a guarantee. Avoid peak summer, as it will be extremely hot.
Where to Stay in Marrakech: Most of the sights are concentrated in the central Medina, or old town. Therefore, I highly recommend staying with this area or just outside, to avoid walking long distances. Keep in mind that if you're right in the heart of the souks, it can be quite busy and noisy. Also cars may not be able to access some of the old town streets, which means you may have to haul luggage from the taxi.
Getting Around Marrakech: The Medina of Marrakech is easily walkable on foot, with most sights being within an 10-20 minute radius. Google Maps is fairly accurate, though can get a bit lost in the souks!
A few restaurants and the Jardin Majorelle are further afield, however taxis are readily available. Though in theory they're metered, in reality it's very difficult to actually get them to agree to using the metre. We generally found we were paying between 20-50 dirhams for a trip.
Safety in Marrakech: For the most part I've felt fairly safe in Marrakech. However, I've generally felt safer with male company, and would have reservations about travelling solo as a female. I've received a lot of unwanted attention when travelling with other females, as opposed to with men - it's a markedly different experience.
Avoid anyone trying to offer you help or advice on the streets - a common scam is trying to tell you you're going the wrong way, or that something is closed, only to take you somewhere themselves, and then expect payment.
What to wear in Marrakech: Marrakech is a predominantly Muslim country, therefore woman are more modestly dressed compared to Western standards. However, as it's so popular with tourists, Western dress is fairly well accepted, and you'll see all sorts. Personally I recommend erring on the side of caution as well as being respectful of the local culture, with below the knee dresses and nothing low cut. Mosques and religious buildings may require more coverage. Read my guide on to what to wear in Morocco as a female traveller for more advice.
For men, you're mostly fine, just keep in mind some restaurants may have dress codes that don't allow sleeveless vests, shorts, flip flops etc.
