Sliema is in Malta.
Sliema and St Julian's are Malta's most modern and most built up areas and where most tourists stay. It is where one will find the most hotels, rental apartments, restaurants, bars, shops and clubs.
Sliema and St Julian's form a near continuous town spread over two adjacent peninsulas with St Julian's to the north (about 20 minutes walk) and Valetta and a third peninsula to the south (about 20 minutes drive).
Malta is a very Catholic country and its people are some of the friendliest and most embracing of tourists in Europe. It is important to note though that certain behavior is strongly frowned upon (such as excessive drunken raucous behavior) and other behavior is illegal (such as topless sunbathing) despite this town being a common tourist area.
Street names in Malta are written first in Maltese, then in English. it becomes helpful to learn both since some people only use one or the other when giving directions and some maps only give the Maltese (on the assumption that the reader will be able to translate).
The area is well signposted from Valetta and the international airport and is about 20 minutes drive from Valletta and 1 hour from the airport.
Buses for Sliema leave the Valletta terminus regularly. Be warned that the Valletta - Sliema/St. Julian's routes can get quite crowded in the summer months. Any number beginning with '6' will take you to or from Sliema and St. Julian's.
The bus routes are very much concentric to Valletta, such that if you wish to travel from Sliema to another part of the Island (in any direction) it will likely be necessary first to travel into Valetta then back out again. This is being reviewed with a view to modernization along with other aspects of public transport.
Please note that in Malta bus drivers own their buses and as such the service is run like a cab rank, leading to some excellent service and some less than ideal. The buses tend to be uniformly ancient.
A ferry regularly (each half hour between 8am-6pm, and later on special occasions such as Notto Bianco) crosses the harbour between Sliema and Valletta. The Valletta stop is on Boat Street and the Sliema stop on Tigné Seafront. Both stops are marked in Google Maps as "Sliema Ferry". A one-way ticket for the five-minute journey costs €1.50 (stand December 2012). For more information check the service provider's website: 
The town is a mostly residential area and as such tourists would tend to travel outside of Sliema during holiday.
However, there are a number of excellent restaurants in and around Howard Street and a tiny supermarket just off Stella Maris Street.
The sea front is well developed and offers shaded seating areas often with free wireless internet, an array of cafes, bars and restaurants and some stone beaches with safe and clean swimming areas.
Sliema is one of the largest and most modern shopping centres in Malta : see 'Buy' below.
Several of Malta's English language schools are located here.
This is Malta's largest and most modern shopping district. You'll find several streets packed full of shops, including international favourites like Zara, Top Shop and Mango, as well as a variety of many designer labels. Malta's prices aren't anything to be excited about, but if you're looking for something trendy, possibly from a store that's more uncommon outside Europe, this is where you'll find it. There is also a small Marks and Spencers, but this one does not have a deli section.
Baracuda in Baluta Bay has some of best food around. Fish is what they do best, fresh out of the sea.
McDonald Sliema Homestay, Borg Olivier Street, tel. +356-27-012825, . A cheap accommodation solution for visitors of all ages in Sliema situated just a minute away from the sea. Maltabudget homestay tel: +356-79052421 Friendly homestay accommodation, ideal for students and holiday makers.
Being the busiest tourist area petty crime associated with it is most rife here. That said there is still relatively little crime compared to many other mediterannean tourist destinations.