Launch QEMU like this:

$  ./x86_64-softmmu/qemu-system-x86_64 -M q35 -display none \
     -nodefconfig -nodefaults -m 512 \
     -blockdev node-name=node-Foo,driver=qcow2,file.driver=file,file.filename=./foo.qcow2 \
     -device virtio-blk,drive=node-Foo,id=virtio0 \
     -netdev user,id=net0,hostfwd=tcp::5555-:22 \
     -device e1000,netdev=net0 -monitor stdio \
     -qmp unix:./qmp-sock,server,nowait


And connect via SSH as following:

[kashyapc@eukaryote ~]$ ssh cirros@localhost -p 5555
cirros@localhost's password: 
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global eth0
    inet6 fec0::5054:ff:fe12:3456/64 scope site dynamic 
       valid_lft 86384sec preferred_lft 14384sec
    inet6 fe80::5054:ff:fe12:3456/64 scope link 
       valid_lft forever preferred_lft forever

$ wget http://google.com
Connecting to google.com ([2a00:1450:4001:817::200e]:80)
Connecting to www.google.be ([2a00:1450:400e:803::2003]:80)
index.html           100% |*********************************************************************************************************************************************| 11355   0:00:00 ETA
$